Converting Spyderprint 225 patch target to i1Profiler

[Ink stained Fingers]

The printer just takes RGB data, not gray or ligh cyan or....the split of the RGB data into the additional ink colors gray - violett, light cyan,...... happens internally in the driver, and the user does not have any control over it. Gray is a color like any other for the printer. You would need to go for a RIP which would let you use more ink colors in the profile generation process, I think i1Profiler would support that. The user cannot even control the amount of black, you would need software like a RIP which bypasses the driver internal color translations, Printfab would let you do that with black - UCR - Undercolor removal.

I did another test with the 720 or 702 patchsheets as reported above - running the test on the Netbit paper - on a Epson T3100X 24 inch printer which runs with 4 colors CMYK and with pigment inks .

I'm getting a total average of DeltaE's of just 1,33 over the 720 patches, and the value for the largest outlier is just 4.16. None of the gray patches are in the upper 10% of delta values. This means that both profiles are practically identical.

 

[crenedecotret]

@crenedecotret : I have made an i1Profiler target that is based on the high quality target + grays of Spyderprint, that originally was based on RGB: 5x5x5, but I have changed it to a better RGB: 7x7x7 and including an bunch of near neutral patches (automatically generated by the i1Profiler target) and combining it with the extra patches from the Spyderprint 225 high quality target (minus the RGB 5x5x5 patches) + the neutralising gray patches + 2 extra patches (orange and violet) to fill up the target to 702 patches witch is divided into 26 rows, each including 27 patches (26x27=702). You might to try to convert it to the ArgyllCMS format with this: much appreciated.

My apologies for the late reply. I was out for a vacation and it got a little hectic at work when I got back

Here is the ArgyllCMS version of the chart. Letter sized. It's "as is". I didn't add any additional patches to this one so it will not completely fill the 2nd page.

 

[pharmacist]

Many thanks @crenedecotret . I did my part of the job and manipulated the target to fit exactly on a single sheet of A4 and optimized for the i1Pro2 scanning table.

 

[buxiaozizai.com]

Another AI creation that will be useful for users of ArgyllCMS. This python script will take a txt file with R G B values and output to a ti1 file that include the necessary data (patch number, RGB on a 0-100 scale and XYZ values). The TI1 file can then be used with printtarg to print for whatever device you are measuring for.

The input format is 1 patch per line, spaces between R G B values, R G B values 0-255

With this, we should be able to reproduce practically any popular profiling chart to argyllcms and see what kind of results we get. As soon as i'm done with my "datacolor replicas", I might go for the old TC9.18 since those RGB values are known.

Thanks for your share.
I found a small error in this script.The argyllCMS .ti1 file XYZ scale is 0~100,but the script generated XYZ scale is 0~1；This may affect chartread .The modified version of the script is attached，and i add a variable "number_start" to change the generated .ti1 SAMPLE_ID.

 

[crenedecotret]

Thanks for your share.
I found a small error in this script.The argyllCMS .ti1 file XYZ scale is 0~100,but the script generated XYZ scale is 0~1；This may affect chartread .The modified version of the script is attached，and i add a variable "number_start" to change the generated .ti1 SAMPLE_ID.

Hi.. this is totally normal for argyllcms. The original script works correctly. You can use r g b values, convert them to TI1 with my script. If you then use printtarg, the tiff files will have the correctt r g b values if you open the in argyllcms

 

[crenedecotret]

@buxiaozizai.com Looking at some documentation you may be right. That's bizarre. I ended up with the 0-1 file because printtarg wouldn't accept the ti1 from my first version which was like yours. When I compared with some existing ti1 files I had, I changed the scale.

Have to tried to read back a chart?