eriksatie Posted January 10, 2019 Share Posted January 10, 2019 Hi, I'm trying to figure out if there's a way to make color picker in White Balance Adjustement working in the way I want. I scan lots of negatives and white balance is really important and not easy to achieve. not only in the blue/yellow axis but also on the magenta/green axis. the color picker could be a great help for that, in particular the possibility to add average multiple whitepoints. I do scan with Silverfast and this software has a tool that works just like that: you sample up to 4 points and you get average white balance on all the color axis. but sometimes I need to do this task after the scan has been made. But from what I see, the Affinity Photo color picker works just for blue/yellow but not for magenta/green. that is a big limitation. In apple photos there is a similar function and it works also for magenta/green. but you can choose only one point and that is usually not enough. a workaround could be to use the info pane and LAB values and do it manually, but there is another problem: the Info Pane Sampler gives values for just one pixel, you can't average 3X3 or larger areas, making useless for this purpose. any solutions? thanks Quote Link to comment Share on other sites More sharing options...
v_kyr Posted January 10, 2019 Share Posted January 10, 2019 Quote Picker—allows you to sample the image to set the white point on which the white balance will be calculated. You can sample using one of the following methods: Click to sample a pixel under the cursor. Drag the cursor across the image to sample all pixels under the cursor. The averaged colour from those pixels is used. Press the Alt key and drag to sample under a rectangular marquee, again using the averaged colour of those pixels. In Develop Persona, a dedicated White Point Tool is used instead of the Picker. It offers the same sampling functionality as the Picker. White Balance adjustment Quote ☛ Affinity Designer 1.10.8 ◆ Affinity Photo 1.10.8 ◆ Affinity Publisher 1.10.8 ◆ OSX El Capitan ☛ Affinity V2.3 apps ◆ MacOS Sonoma 14.2 ◆ iPad OS 17.2 Link to comment Share on other sites More sharing options...
carl123 Posted January 10, 2019 Share Posted January 10, 2019 The Help topic is incomplete You can also hold the Shift Key to "add average multiple whitepoints" When using the picker (Photo Persona) Quote To save time I am currently using an automated AI to reply to some posts on this forum. If any of "my" posts are wrong or appear to be total b*ll*cks they are the ones generated by the AI. If correct they were probably mine. I apologise for any mistakes made by my AI - I'm sure it will improve with time. Link to comment Share on other sites More sharing options...
eriksatie Posted January 10, 2019 Author Share Posted January 10, 2019 2 hours ago, v_kyr said: White Balance adjustment Thanks I've seen that. but it works only with the "white balance" slider (blu to yellow), not with the "tint" slider (magenta to green). with film scans it is quite common to have problems also in this area. Being the picker under both the slider one would assume that it will set both, but this is not the case Quote Link to comment Share on other sites More sharing options...
v_kyr Posted January 10, 2019 Share Posted January 10, 2019 You may want to note and indicate this via a reproducable example in the bug request section of the forum, so it might be reviewed and then hopefully get fixed. Quote ☛ Affinity Designer 1.10.8 ◆ Affinity Photo 1.10.8 ◆ Affinity Publisher 1.10.8 ◆ OSX El Capitan ☛ Affinity V2.3 apps ◆ MacOS Sonoma 14.2 ◆ iPad OS 17.2 Link to comment Share on other sites More sharing options...
eriksatie Posted January 10, 2019 Author Share Posted January 10, 2019 2 minutes ago, v_kyr said: You may want to note and indicate this via a reproducable example in the bug request section of the forum, so it might be reviewed and then hopefully get fixed. I don't know if it is a bug or an intended behavior... but I will post it, thanks Quote Link to comment Share on other sites More sharing options...
lepr Posted January 10, 2019 Share Posted January 10, 2019 . Quote Link to comment Share on other sites More sharing options...
R C-R Posted January 10, 2019 Share Posted January 10, 2019 38 minutes ago, eriksatie said: ... but it works only with the "white balance" slider (blu to yellow)... FWIW, white balance sets the color temperature of an image. Changing it makes the image appear cooler or warmer, not bluer or yellower. Color temperature is really only applicable to images illuminated by light that closely approximates black body radiation -- basically, the light emitted by (not reflected from) objects when heated to some sufficiently high temperature. This is what we are talking about when we say something has been heated enough to glow "red hot" or "white hot." In this context "red" is cooler than "white." Adjusting the tint does not change the color temperature of an image. The tint adjustment is useful for removing color casts, particularly those caused by light sources that do not approximate black body radiation, like fluorescent lights. Quote All 3 1.10.8, & all 3 V2.4.1 Mac apps; 2020 iMac 27"; 3.8GHz i7, Radeon Pro 5700, 32GB RAM; macOS 10.15.7 Affinity Photo 1.10.8; Affinity Designer 1.108; & all 3 V2 apps for iPad; 6th Generation iPad 32 GB; Apple Pencil; iPadOS 15.7 Link to comment Share on other sites More sharing options...
eriksatie Posted January 10, 2019 Author Share Posted January 10, 2019 2 minutes ago, R C-R said: FWIW, white balance sets the color temperature of an image. Changing it makes the image appear cooler or warmer, not bluer or yellower. Color temperature is really only applicable to images illuminated by light that closely approximates black body radiation -- basically, the light emitted by (not reflected from) objects when heated to some sufficiently high temperature. This is what we are talking about when we say something has been heated enough to glow "red hot" or "white hot." In this context "red" is cooler than "white." Adjusting the tint does not change the color temperature of an image. The tint adjustment is useful for removing color casts, particularly those caused by light sources that do not approximate black body radiation, like fluorescent lights. Ok so maybe I'm using the wrong tool (but I think it is the right one, just not working as expected) My intent is to get rid of color casts of scanned films. Usually this is done by using some kind of tool that has two slider: one for blu/yellow axis and one for green/magenta axis. Some more advanced tool also have a picker that helps you doing this automatically. You pick what you think it should be a neutral grey area and the two slider get adjusted. Apple photo has such tool and it works quite good. Some even more advanced tool allows you to choose more than one points and the tool average them to have a better global color cast correction. Silverfast have this kind of tool and it works great but you can only use during scans and not after. Is there a more appropriate tool in Affinity to do this job? Quote Link to comment Share on other sites More sharing options...
Staff MEB Posted January 10, 2019 Staff Share Posted January 10, 2019 Hi eriksatie, Welcome to Affinity Forums You are using the correct tool but currently the picker only adjusts the white Balance slider not the Tint as you noticed.This is already logged for the dev team to take a look/comment but there wasn't developments here yet. I've bumped the report and added a link to this thread. Quote A Guide to Learning Affinity Software Link to comment Share on other sites More sharing options...
eriksatie Posted January 10, 2019 Author Share Posted January 10, 2019 1 minute ago, MEB said: Hi eriksatie, Welcome to Affinity Forums You are using the correct tool but currently the picker only adjusts the white Balance slider not the Tint as you noticed.This is already logged for the dev team to take a look/comment but there wasn't developments here yet. I've bumped the report and added a link to this thread. Thanks MEB for the feedback. Hope it will be implemented. It would be great for correcting color cast of film scans, thanks to the ability to add more points or a rectangle. Quote Link to comment Share on other sites More sharing options...
carl123 Posted January 10, 2019 Share Posted January 10, 2019 @eriksatie Do you have a sample of the sort of images you are correcting One image before any corrections and one after you have corrected it using the white balance tool Or better still an AFPhoto document with the image and the White Balance Adjustment you have adjusted There are sometimes different ways to achieve the desired results in Affinity Quote To save time I am currently using an automated AI to reply to some posts on this forum. If any of "my" posts are wrong or appear to be total b*ll*cks they are the ones generated by the AI. If correct they were probably mine. I apologise for any mistakes made by my AI - I'm sure it will improve with time. Link to comment Share on other sites More sharing options...
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