Working with color in Affinty Photo remains illogical to me. This time I want to create an image from scratch in Photo on Windows.
I started a new document, a photo with Color Format set to RGB/8 and Color Profile to sRGB IEC61966-2.1. I changed the units for the color selector to percentages and set the color values for red to 100 and for green and blue to 0. The resulting color does not look full red, but more orange/red. The attached file hopefully shows the problem.
That image is a screenshot of the new document in Photo that is opened as another document. Clearly visible is the difference between the color in the inner document and the Photo UI. The hex value of the inner document is #F7002D, for the UI it's #D63C20. Both are not #FF0000, which I expected for 100% red. I got these values by taking a new screenshot of Photo with the screenshot open, pasted that into Paint.net and picking the colors.
Is there a preference or other procedure to create a new image that forces Photo to display colors like other Windows software? These differences between Photo and browsers make it hard to imagine what the end result will when using Photo. For now, I switched to Paint.net because it handles colors as I expect.
To be sure this wasn't caused by some setting I changed, I retried with all preferences reset to their default.