smg Posted December 23, 2021 Share Posted December 23, 2021 In the attached file I have draw a two gradient in Lab, I am preparing color course slide, so if theory is correct I will got two different colours. Some one know why having two different Lab value they on screen appear as the same color? Thank you strange color.afdesign Quote Link to comment Share on other sites More sharing options...
Staff Pauls Posted December 23, 2021 Staff Share Posted December 23, 2021 this is what I get Quote Link to comment Share on other sites More sharing options...
Staff Pauls Posted December 23, 2021 Staff Share Posted December 23, 2021 you'll see a bigger difference if you lower the L value to 75 Quote Link to comment Share on other sites More sharing options...
smg Posted December 23, 2021 Author Share Posted December 23, 2021 7 minutes ago, Pauls said: you'll see a bigger difference if you lower the L value to 75 Oh... yes. But what I was expected are different colors see attached. The color of the Lab axes. Eventually color corrected by the ICC monitor profile, but I was not expected such difference. 😃 strange color expected as in theory.afdesign Quote Link to comment Share on other sites More sharing options...
Staff Pauls Posted December 23, 2021 Staff Share Posted December 23, 2021 the 100 L value will be shifting some of those colours - not sure where your source is from Photoshop gives similar results for me Max P 1 Quote Link to comment Share on other sites More sharing options...
NotMyFault Posted December 24, 2021 Share Posted December 24, 2021 If you don’t trust Affinity you could use free online tools to convert from LAB to RGB. Both LAB colors differ only slightly : 0 / 255 / 250 vs 0 / 255 / 255 Looks perfectly ok in Affinity. Max P 1 Quote Mac mini M1 A2348 | Windows 10 - AMD Ryzen 9 5900x - 32 GB RAM - Nvidia GTX 1080 LG34WK950U-W, calibrated to DCI-P3 with LG Calibration Studio / Spider 5 iPad Air Gen 5 (2022) A2589 Special interest into procedural texture filter, edit alpha channel, RGB/16 and RGB/32 color formats, stacking, finding root causes for misbehaving files, finding creative solutions for unsolvable tasks, finding bugs in Apps. My posts focus on technical aspects and leave out most of social grease like „maybe“, „in my opinion“, „I might be wrong“ etc. just add copy/paste all these softeners from this signature to make reading more comfortable for you. Otherwise I’m a fine person which respects you and everyone and wants to be respected. Link to comment Share on other sites More sharing options...
Max P Posted December 24, 2021 Share Posted December 24, 2021 Yes yes you are right, it's a bug some day ago, in Affinity Photo, I saw the same incoherence, very surprised. From memory it seems to me that it was correct, some time ago Quote Link to comment Share on other sites More sharing options...
Max P Posted December 24, 2021 Share Posted December 24, 2021 I just tried with Krita, l*a*b* (32 bit) L100 seems to be a special case where the terminals a* and b* on the left side have the same colour. I just learned something, this day Pauls NotMyFault you were right, sorry for my previous post Merry Christmas to you NotMyFault 1 Quote Link to comment Share on other sites More sharing options...
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