Lem3 Posted July 25, 2018 Share Posted July 25, 2018 I should preface by saying I'm new to both Affinity and camera raw processing. I take a photo of a standard grey card as raw (.cr2) and open in Develop (Assistant turned off). The onscreen image is medium grey. I set a sampler point in the card, the rgb values are 55,55,53. Why aren't they all 128 (or so)? If I enable the Assistant (and the tone curve) the rgb values are all around 120, but the image is much lighter than the grey card. Quote Link to comment Share on other sites More sharing options...
Staff Lee D Posted July 27, 2018 Staff Share Posted July 27, 2018 Hi Lem3 Welcome to the forums. Why are you expecting the sampled colour RGB values all to be 128? Some cameras can be setup to use an image with a grey card as reference for the white balance, do you know if was done? Quote Link to comment Share on other sites More sharing options...
Lem3 Posted July 28, 2018 Author Share Posted July 28, 2018 I expected the values to be around 128 because that's what the card image measures in Camera Raw. The AF image is visually much lighter than medium grey, the sampler from Photoshop measures it at about 180, 180, 180. I assume I've done something wrong in Affinity. Quote Link to comment Share on other sites More sharing options...
walt.farrell Posted July 28, 2018 Share Posted July 28, 2018 Just guessing: when you turned off Affinity Photo's Develop Assistant you ended up seeing what the camera actually recorded, which probably does not match the actual color of your grey card. The values in Camera Raw and Photoshop might be different because you did not also disable all their processing. Also, what camera and lens are you using, what OS, and (if Mac) which raw engine did you use in Affinity Photo? Quote -- Walt Designer, Photo, and Publisher V1 and V2 at latest retail and beta releases PC: Desktop: Windows 11 Pro, version 23H2, 64GB memory, AMD Ryzen 9 5900 12-Core @ 3.00 GHz, NVIDIA GeForce RTX 3090 Laptop: Windows 11 Pro, version 23H2, 32GB memory, Intel Core i7-10750H @ 2.60GHz, Intel UHD Graphics Comet Lake GT2 and NVIDIA GeForce RTX 3070 Laptop GPU. iPad: iPad Pro M1, 12.9": iPadOS 17.4.1, Apple Pencil 2, Magic Keyboard Mac: 2023 M2 MacBook Air 15", 16GB memory, macOS Sonoma 14.4.1 Link to comment Share on other sites More sharing options...
lepr Posted July 28, 2018 Share Posted July 28, 2018 . Quote Link to comment Share on other sites More sharing options...
Lem3 Posted July 28, 2018 Author Share Posted July 28, 2018 I understand those explanations but they don't apply to the actual problem. The comparative image I posted is of AP with the image assistant turned on. Both Camera Raw and AP Develop report the card as 128,128,128 (or so) but the AP image is much too light. If I include a grey card in a photograph then adjust the exposure in AP so it samples at 128,128,128 I don't think I'm going to like the result. Still assuming I'm doing something wrong. Windows 7, Canon S120, AP 1.6.4.104, Camera Raw 9.1.1 Quote Link to comment Share on other sites More sharing options...
lepr Posted July 28, 2018 Share Posted July 28, 2018 . Quote Link to comment Share on other sites More sharing options...
Lem3 Posted July 28, 2018 Author Share Posted July 28, 2018 So I should include the grey card and adjust exposure in AP to 55,55,55? I can live with that, but I suspect I won't be the last one tripped up by this major variance from CR/LR. Quote Link to comment Share on other sites More sharing options...
lepr Posted July 28, 2018 Share Posted July 28, 2018 . Quote Link to comment Share on other sites More sharing options...
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