[Tool] ChromIQ – a macOS and Windows GUI for ArgyllCMS printer profiling (v4.2.0)

In 4.2.2 I made it so that you create a chart with hexagonal patches for the CR30 in guided mode the hexes are rotated. That way you can use a ruler as guidance for reading the strips which should make it a litte easier and it also fits 6 more patches on one sheet of A4 portrait paper. This was a suggestion from another user which I did not think about before.
Spacers now also work correctly for those hexagons (they hurt my eyes a little and of course they are optional and off by default but they work now).

Bild 10.09.26 um 10.37.jpeg
 
A message from Knut:

Could you please remind Arno and the users that there are 130 presets with ready made patch sets ready for a user to use, so they do not need to create their own, or can use them as starting point for editing the patches using the patch editor… Also, they would start by reading the landing page

https://itsab1989.github.io/ChromIQ/

And read the first help card “Getting started (a tour of ChromIQ)”


So now you know where to look at :)
Hi all,

Today, I had an entire Sunday afternoon to finally dig deeper into the seemingly endless possibilities of ChromIQ, read extensively through user guides, played around a bit, and see now where it far surpasses the limited options of the i1Profiler software. Yes, I found the ready-made patch sets, and also played around with the patch generator. It seems that ChromIQ enables the creation of profiles as refined as one could ever need in terms of colors, which is brilliant in itself, but its main strengths (to me, and as already pointed out by @pharmacist) also lie in the possibilities to create profiles optimized for neutral B&W printing, which is one of my goals.

This is my current understanding: When I print with only one black ink (not willing to give up color printing by replacing all inks with various greys...), highlights become very pixellated, so one needs to blend in some color inks to retain smooth highlights. This is only possible when the greys remain fully neutral, which requires profiling specifically around neutral greys and ChromIQ has me covered: I can create custom patch sets that focus around the neutral greys (as @pharmacist already pointed out) which is easily visualized in the 3D cube in the patch generator. Hence, with ChromIQ, I can generate two separate profiles: One optimized for color printing, and one optimized for pure B&W printing.

What still puzzles me is the amount of patches that can be fitted onto one sheet of paper. This number seems to vary quite a bit, but should depend on the minimum patch size that is acceptable to my i1Pro2, no? Any thoughts on what this could be?

Thanks in advance,

Arno
 
Knut just made me aware of your post here. Thanks for your kind words. This is really nice to hear :)

I will just paste Knuts reply here:

You can tell Arno that all the i1Pro presets with 7.5mm patch width is tuned in to what is considered the maximum patch density for a i1Pro2, also taking into account the ruler-board limitations for strip length. Bigger patches are easier to scan. 😊


Edit: Since you mentioned black and white printing in particular, do you maybe know some "best practices" for this? Usually I am pretty happy with my (color) prints. Yesterday I tried a very simple light setup that I saw on social media to take some photos of my daughter. I can't remember really doing b&w before but I wanted to give it a try. In the end a few pictures turned out ok, I tried editing them and noticed that b&w edits are not as easy as I thought. Then I settled with an edit I made and wanted to print it. I only had some semi gloss paper at hand which I like for my color prints. But even in the softproof I could already see a slight blue cast as soon as I enabled "simulate paper white" also it now looked somewhat flat. I played around a bit and just out of curiosity tried absolute colorimetric intent (usually I use relative). Sooftproof looked better immediately (at least more like what I wanted the image to look and what it looked on my screen without softproofing). The blue cast was gone and the print had more contrast. I don't want to overstate this. If I showed both of those prints my mother she would not see a difference, but I clearly do.

Another thing I have noticed: my iPhone brightens up those images a lot. On my computer the background of the portrait is a very dark grey - most people looking at it would say black. On my phone the same background is now a lot brighter. And not because my screen brightness is was so high. I don't notice this to the same extent with color images. Or maybe this is just more noticable with b&w?

Anyway, I would be happy for any tipps. Thanks in advance!
 
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Knut just made me aware of your post here. Thanks for your kind words. This is really nice to hear :)

I will just paste Knuts reply here:

You can tell Arno that all the i1Pro presets with 7.5mm patch width is tuned in to what is considered the maximum patch density for a i1Pro2, also taking into account the ruler-board limitations for strip length. Bigger patches are easier to scan. 😊


Edit: Since you mentioned black and white printing in particular, do you maybe know some "best practices" for this? Usually I am pretty happy with my (color) prints. Yesterday I tried a very simple light setup that I saw on social media to take some photos of my daughter. I can't remember really doing b&w before but I wanted to give it a try. In the end a few pictures turned out ok, I tried editing them and noticed that b&w edits are not as easy as I thought. Then I settled with an edit I made and wanted to print it. I only had some semi gloss paper at hand which I like for my color prints. But even in the softproof I could already see a slight blue cast as soon as I enabled "simulate paper white" also it now looked somewhat flat. I played around a bit and just out of curiosity tried absolute colorimetric intent (usually I use relative). Sooftproof looked better immediately (at least more like what I wanted the image to look and what it looked on my screen without softproofing). The blue cast was gone and the print had more contrast. I don't want to overstate this. If I showed both of those prints my mother she would not see a difference, but I clearly do.

Another thing I have noticed: my iPhone brightens up those images a lot. On my computer the background of the portrait is a very dark grey - most people looking at it would say black. On my phone the same background is now a lot brighter. And not because my screen brightness is was so high. I don't notice this to the same extent with color images. Or maybe this is just more noticable with b&w?

Anyway, I would be happy for any tipps. Thanks in advance!
Hi Sebastian, yes, B&W is way harder to get right than color, but this requires a back story.

I’m shooting since I was 11, started out on film, became a Nikon guy, and was an early adapter for digital, first aps-c, then full frame, had a good job and was able to afford decent gear, but then I got bored. Things were too easy and too perfect: The sterile clinical look of high-end modern optics on ever-more-perfect sensors. At the same time, photography was still a lonely hobby. So I decided three things:

1. Go back to film, mainly B&W so I could easily do my own development and scanning.

2. Optimize development and scanning of 35mm using my physics background to the point that it could compete with MF, so I could keep my gear compact. 35mm is capable of 100+ line-pairs per mm (~100 MPix) if done well. The limitation is digitization.

3. To make photography more social: Specialize in portrait photography, learning through model photography, with the goal to be able to grab any stranger off the street and create a great “art” portrait within 5 minutes.

I had this very specific look in my inner eye that I pursued for at least three years. It meant using 1950’s Sonnar-type optics (now finally gave in and have a 1957 Leica as my main camera…) and trying out all available B&W films in my search for the tonality and rendering that I was after. Eventually I landed on Kodak double x cinema film that needs to be re-spooled for 35mm still photography. All this was no easy task and many of my adventures can be read on my blog (https://www.arnogodeke.com/Blog).

So after some years, a steep learning curve, purchasing and selling a lot of old film camera gear, and building nearly an optical lab in my home, I am very close to finally achieving the raw but technically perfect, and with great rendering and tonality, look that I was after.

So now I have a portfolio that so far lives in the digital domain only with the goal to create the end product: Large printed B&W pictures that correctly render the look and tonal ranges that I fought to get over all these years. The final goal is to present my “art” in an exhibition somewhere. For this, I need good B&W prints with settings that I can control myself. Hence, my quest to dive into printer calibration.

I dabbled with QuadtoneRIP, thinking that I could create neutral B&W prints when I would only use a black ink cartridge, but to print light grey, one obviously (with hindsight) will get pixelated highlights, not representing the smooth tonal ranges that I pursued so hard in the negatives. One route is to replace all the color cartridges with various grey inks, but this means giving up on color, or buying a used multi-ink printer to dedicate to B&W only. The second route is to get colors so well calibrated that they can be mixed in to create smooth tonal ranges in the highlights, but this requires indeed very accurate profiling to not create color casts. Hence, I’m here, learning about ChromIQ.

Today I tried creating patches all around neutral grey, thinking color would not be relevant, but the resulting profiles don’t work: Huge color casts and they depend on brightness, so my initial theory of profiling only B&W and forgetting about color doesn’t work: Accurate and neutral B&W with a color printer requires actually all the colors to be accurate as well.

One thing I noticed today is that initially I couldn’t get a good profile, because close to half of the patches were far from what they should be (huge delta E). I suspect now that using a hairdryer to speed things up wasn’t a good idea, but maybe it’s a glitch when spreading patches over multiple pages. I don’t know yet. Eventually, I rescanned multiple lines on an A4 and got a profile which was stated “excellent”. With that, I printed a B&W shot that originated from cinema film and my jaw dropped when I saw the tonal ranges that came out of the printer. So it worked in the end, and far surpassed anything I had seen printed in B&W before, including prints from some well-respected experts.

In short: ChromIQ works and gets me and my trusty old Epson R1900 color printer to a B&W print quality that I could have only dreamed of.

With respect to shooting digital colors and converting that to B&W: It is indeed hard to edit properly, and in no way it can approach even remotely what can be done when starting out with B&W (cinema) film and optimized scanning. The tonality, rendering, and look can simply not be replicated with a digital camera. I feel that I’m now approaching analog enlargements as used to be done by folks who have decades of experience in darkrooms. I have a friend who has worked in a high end analog lab in Paris for most of his career and together we’re pursuing the quest to get inkjet prints that approach that analog level. ChromIQ seems an enabling tool, seemingly enabling, or perhaps even surpassing, but at least approaching, on a color printer what QuadtoneRIP does for dedicated B&W printers. Well done!

As to differences between iPhone screens and computer monitors: I assume that you calibrated your monitor with your colormunki and set it at around 120 candella (? I think that was the unit) fixed brightness? A phone screen, although perhaps good, is not calibrated and changes brightness depending on environment. In my experience, color is indeed more forgiving in looking “okay or good enough” than B&W, which much more depends on accuracy of tonal distribution (it’s the only thing that makes the picture).

Just my few cents.

Arno
 
Hi all,

Today, I had an entire Sunday afternoon to finally dig deeper into the seemingly endless possibilities of ChromIQ, read extensively through user guides, played around a bit, and see now where it far surpasses the limited options of the i1Profiler software. Yes, I found the ready-made patch sets, and also played around with the patch generator. It seems that ChromIQ enables the creation of profiles as refined as one could ever need in terms of colors, which is brilliant in itself, but its main strengths (to me, and as already pointed out by @pharmacist) also lie in the possibilities to create profiles optimized for neutral B&W printing, which is one of my goals.

This is my current understanding: When I print with only one black ink (not willing to give up color printing by replacing all inks with various greys...), highlights become very pixellated, so one needs to blend in some color inks to retain smooth highlights. This is only possible when the greys remain fully neutral, which requires profiling specifically around neutral greys and ChromIQ has me covered: I can create custom patch sets that focus around the neutral greys (as @pharmacist already pointed out) which is easily visualized in the 3D cube in the patch generator. Hence, with ChromIQ, I can generate two separate profiles: One optimized for color printing, and one optimized for pure B&W printing.

What still puzzles me is the amount of patches that can be fitted onto one sheet of paper. This number seems to vary quite a bit, but should depend on the minimum patch size that is acceptable to my i1Pro2, no? Any thoughts on what this could be?

Thanks in advance,

Arno

Dag Arno,

If needed you can cramp up to 918 patches on a single sheet of A4 (but you cannot press the pamper under the clamp of the jig for the first 4 rows as it needs the whole surface:

I have made a single sheet 918 patch target on A4 for the i1Profiler using the superior patch generator of ChromIQ emphasizing the neutral and near neutral greys:

1790054466659.png


I have measured the patch width and it is 7.2 mm (patch height is 7.5 mm).

Taking into account the headway for the clamp area (when completely inserting the paper onder the clamp and aligning completely to the right border of the scanning table) then 744 patches (24 rows of 31 patches) is about the maximum you can get for A4 (important: choose a smaller separator bar with -A0.5), but then you have to scan it slowly and steadily. A safer and more comfortable amount is 648 (24 rows of 27 patches).

I hope this will be helpful for you.
 
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Hi Sebastian, yes, B&W is way harder to get right than color, but this requires a back story.

I’m shooting since I was 11, started out on film, became a Nikon guy, and was an early adapter for digital, first aps-c, then full frame, had a good job and was able to afford decent gear, but then I got bored. Things were too easy and too perfect: The sterile clinical look of high-end modern optics on ever-more-perfect sensors. At the same time, photography was still a lonely hobby. So I decided three things:

1. Go back to film, mainly B&W so I could easily do my own development and scanning.

2. Optimize development and scanning of 35mm using my physics background to the point that it could compete with MF, so I could keep my gear compact. 35mm is capable of 100+ line-pairs per mm (~100 MPix) if done well. The limitation is digitization.

3. To make photography more social: Specialize in portrait photography, learning through model photography, with the goal to be able to grab any stranger off the street and create a great “art” portrait within 5 minutes.

I had this very specific look in my inner eye that I pursued for at least three years. It meant using 1950’s Sonnar-type optics (now finally gave in and have a 1957 Leica as my main camera…) and trying out all available B&W films in my search for the tonality and rendering that I was after. Eventually I landed on Kodak double x cinema film that needs to be re-spooled for 35mm still photography. All this was no easy task and many of my adventures can be read on my blog (https://www.arnogodeke.com/Blog).

So after some years, a steep learning curve, purchasing and selling a lot of old film camera gear, and building nearly an optical lab in my home, I am very close to finally achieving the raw but technically perfect, and with great rendering and tonality, look that I was after.

So now I have a portfolio that so far lives in the digital domain only with the goal to create the end product: Large printed B&W pictures that correctly render the look and tonal ranges that I fought to get over all these years. The final goal is to present my “art” in an exhibition somewhere. For this, I need good B&W prints with settings that I can control myself. Hence, my quest to dive into printer calibration.

I dabbled with QuadtoneRIP, thinking that I could create neutral B&W prints when I would only use a black ink cartridge, but to print light grey, one obviously (with hindsight) will get pixelated highlights, not representing the smooth tonal ranges that I pursued so hard in the negatives. One route is to replace all the color cartridges with various grey inks, but this means giving up on color, or buying a used multi-ink printer to dedicate to B&W only. The second route is to get colors so well calibrated that they can be mixed in to create smooth tonal ranges in the highlights, but this requires indeed very accurate profiling to not create color casts. Hence, I’m here, learning about ChromIQ.

Today I tried creating patches all around neutral grey, thinking color would not be relevant, but the resulting profiles don’t work: Huge color casts and they depend on brightness, so my initial theory of profiling only B&W and forgetting about color doesn’t work: Accurate and neutral B&W with a color printer requires actually all the colors to be accurate as well.

One thing I noticed today is that initially I couldn’t get a good profile, because close to half of the patches were far from what they should be (huge delta E). I suspect now that using a hairdryer to speed things up wasn’t a good idea, but maybe it’s a glitch when spreading patches over multiple pages. I don’t know yet. Eventually, I rescanned multiple lines on an A4 and got a profile which was stated “excellent”. With that, I printed a B&W shot that originated from cinema film and my jaw dropped when I saw the tonal ranges that came out of the printer. So it worked in the end, and far surpassed anything I had seen printed in B&W before, including prints from some well-respected experts.

In short: ChromIQ works and gets me and my trusty old Epson R1900 color printer to a B&W print quality that I could have only dreamed of.

With respect to shooting digital colors and converting that to B&W: It is indeed hard to edit properly, and in no way it can approach even remotely what can be done when starting out with B&W (cinema) film and optimized scanning. The tonality, rendering, and look can simply not be replicated with a digital camera. I feel that I’m now approaching analog enlargements as used to be done by folks who have decades of experience in darkrooms. I have a friend who has worked in a high end analog lab in Paris for most of his career and together we’re pursuing the quest to get inkjet prints that approach that analog level. ChromIQ seems an enabling tool, seemingly enabling, or perhaps even surpassing, but at least approaching, on a color printer what QuadtoneRIP does for dedicated B&W printers. Well done!

As to differences between iPhone screens and computer monitors: I assume that you calibrated your monitor with your colormunki and set it at around 120 candella (? I think that was the unit) fixed brightness? A phone screen, although perhaps good, is not calibrated and changes brightness depending on environment. In my experience, color is indeed more forgiving in looking “okay or good enough” than B&W, which much more depends on accuracy of tonal distribution (it’s the only thing that makes the picture).

Just my few cents.

Arno
This sounds like a long journey that you went through, thanks for sharing this here!
Yes, my MacBooks screen is calibrated. / profiled. And although my phones screen obviously is not I usually have a rough idea about what to expect. But with those black and white images things are really different. I was pretty naive thinking that if you take color out of the equation things would be easier. Seems like I was wrong here.

Here is from Knut:
Maybe you could give Arno this comment from me:


Thank you for your great feedback 😊 Also, It sounds like, with your digitising need, you could make use of the capability of ChromIQ to create a very large target for scanners (1500 to 3000 patches over multiple pages, on the desired paper), which then could profile a scanner much better than a pre-bought target with less than 1000 patches. That might also help in your workflow to assure that no black and white image that is digitised get wrong balance of greys. The printer’s ability to print a good B&W image with a profile comes on top of that, so if the scan is not well done, the printing of it will not turn out as desired either (as you undoubtedly know). The need for perfection in this case is a very good test if ChromIQ can deliver what what you need, if you are willing to test it and report back to us the results…. 😊
 
@Im-back-Arno : it is indeed important to consider all colours (including near neutrals and greys) to generate the printer profile. So you need sampling the whole RGB colour cube and not only emphasize the near neutrals and greys (not only to neutralise the greys but also maximize the grey gradations so you get the best grey separations in the shadows and high light details), but also sample the outer corners of the RGB cube so you get a robust outer shell of your cube fitting. So both are needed and like you have experienced all the other colours are needed for a good neutral print with optimal grey separation.

Anyhow, again my congratulations to Sebastian @itsab1989 and also to Knut (who I think should consider to make a new profile at printerknowledge.com) for all the work they have done. I have experienced alot with ChromIQ especially with the superior patch generator exceeding the results of not only the poorly designed patch generator of i1Profiler but I think also better than ArgyllCMS patch generator. @Alan G has confirmed my assesment about the near neutrals/greys (with 2 rings setting apart with 4 steps) that a single target can give the same or even better results as the 2 steps method of ArgyllCMS (first target to determine the exact neutral axis and a secondary target to sample the previously determined neutral axis of a given paper/ink/printer combination).

Actually my latest test I have done is a simple 550 patch target with an RGB cube of 7x7x7 + extra sampling of the 8 RGB outer corners + 31 step grey gradation + a single ring near neutral patches of 6x21 patches (off set: 7) and I was blown away by the good grey separations and details in the shadows and high lights in printing a black and white image on matte paper (Calumet) with such a small patch count. It performs better than the TC9.18 target I have used to produce target for this paper (containing 918 patches): so patch count is not everything. Choosing which area of the RGB colour cube should be sampled is much more important for a given patch count.

This is the 550 patch target I have made for my i1Pro1 with its scanning jig/table for i1Profiler software using the nifty and smart patch generator of ChromIQ (which needs a slightly taller patch height and width than the i1Pro2, but can be read equally well by the i1Pro2 and the i1pro3):

1790085875204.png


A very simple and small patch target but giving incredibly good profiles.
 
@Im-back-Arno : it is indeed important to consider all colours (including near neutrals and greys) to generate the printer profile. So you need sampling the whole RGB colour cube and not only emphasize the near neutrals and greys (not only to neutralise the greys but also maximize the grey gradations so you get the best grey separations in the shadows and high light details), but also sample the outer corners of the RGB cube so you get a robust outer shell of your cube fitting. So both are needed and like you have experienced all the other colours are needed for a good neutral print with optimal grey separation.

Anyhow, again my congratulations to Sebastian @itsab1989 and also to Knut (who I think should consider to make a new profile at printerknowledge.com) for all the work they have done. I have experienced alot with ChromIQ especially with the superior patch generator exceeding the results of not only the poorly designed patch generator of i1Profiler but I think also better than ArgyllCMS patch generator. @Alan G has confirmed my assesment about the near neutrals/greys (with 2 rings setting apart with 4 steps) that a single target can give the same or even better results as the 2 steps method of ArgyllCMS (first target to determine the exact neutral axis and a secondary target to sample the previously determined neutral axis of a given paper/ink/printer combination).

Actually my latest test I have done is a simple 550 patch target with an RGB cube of 7x7x7 + extra sampling of the 8 RGB outer corners + 31 step grey gradation + a single ring near neutral patches of 6x21 patches (off set: 7) and I was blown away by the good grey separations and details in the shadows and high lights in printing a black and white image on matte paper (Calumet) with such a small patch count. It performs better than the TC9.18 target I have used to produce target for this paper (containing 918 patches): so patch count is not everything. Choosing which area of the RGB colour cube should be sampled is much more important for a given patch count.

This is the 550 patch target I have made for my i1Pro1 with its scanning jig/table for i1Profiler software using the nifty and smart patch generator of ChromIQ (which needs a slightly taller patch height and width than the i1Pro2, but can be read equally well by the i1Pro2 and the i1pro3):

View attachment 19272

A very simple and small patch target but giving incredibly good profiles.
Thanks a lot Nelson! But part of the truth is that a lot of this was shaped around your feedback especially in the earlier stages where even the basic things had bugs. Without your testing and sharing your knowledge ChromIQ would not be what it is right now. So a big thanks to you as well!
 
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