GregL65

Excellent, thanks!

I want to replace a single RGB value across the entire image, to another single RGB value. How can I do that?

Thanks @Lisbon, that's what I needed. I'll watch the video you suggested. I'll take a look at the methods others suggested too, but yours is very simple and quick now that I know how to do it.

Thanks! How did you get the color to apply to the image? I was able to get it to work after a lot of playing with the Gradient Map dialog, but I'm having trouble repeating it consistently for future reference. Here's what I've been trying: Open the file. Click Adjustment > Gradient Map > Default. That turns the black to red and brings up the Gradient Map dialog. In the Gradient Map dialog, click the Color rectangle (which is currently green). That brings up the RGB sliders. In the RGB sliders' edit boxes, enter 0/84/163. Dismiss the RGB Sliders dialog by clicking back on the Gradient Map dialog. Now the Color rectangle is 0/84/163 blue. The gradient scale on the dialog goes from red on the left to blue on the right. Position is 50%, and the 50% position on the gradient scale looks like the correct blue. But.... the image is still red. From there, I tried various things with the controls in the Gradient Map dialog, and on a couple of occasions the image color has suddenly gone to the correct blue. I saved it so I'm good for now. But I don't know how to repeat this for future images. So...once I set the RGB sliders to the desired color and dismiss the RGB slider's dialog to go back to the Gradient Map dialog, what are the next steps to apply that color to the image?

I think what I'm trying to do is probably pretty simple for someone who knows image editing better than I do, but I've been banging my head against the wall on this one for a while and it's time to ask the experts. I have a grayscale image with a clear background. I want to replace the black and gray pixels with RGB 0/84/163 blue, respecting the brightness of each pixel. I found how to replace ALL the black and gray pixels with the blue, but without respecting pixel brightness. That makes the lines look thick and unattractive. That's not what I need. I looked at several videos on changing color, and this one seems to me to be what I'm looking for. However, when I try it, the clear background pixels become blue and the black ones stay black. Clearly I'm doing something wrong but I don't understand what: I've uploaded the image I'm working with. Can anyone show me how this is done? FWIW this is meant for display as a very small image. Originally, in 1913, it was in a single newspaper column no more than 2 inches wide.

I'm trying to transition from Picture Window Pro. I'm seeing some differences in paint brush behavior that I don't understand: First, in PWP, with a white brush color and with medium settings for opacity and hardness, if I run the brush back and forth over a spot it will get lighter and lighter. With Affinity Photo, I have to lift the the mouse button and press it down again with each pass; otherwise only the first pass has any effect. Is it possble to make it not require a new mouse press for each pass? Second, the brush affects pixels outside the brush circle. I could get used to that, but it's disconcerting and makes it difficult to judge exactly where to brush. I've been having to try several more times to get a given effect than I'm used to with PWP. Is it possible to restrict the brush's effect to the brush circle? Third, with a white brush in PWP, no matter the opacity and hardness settings I could get an area of pixels to go completely white with enough passes over it. In Affinity Photo, with Opacity at 50% or less, they never quite go completely white no matter how many times I pass over them; they lighten to RGB 254/254/254 and then subbornly stay there. To get them to go completely white I have to set Opacity to 51% or higher. Is there a way in Affinity Photo to make them go completely white at lower opacity settings?

Wow smadell, that is beautiful! This is the first I've ever done anything with layers or masks, thanks so much for the walkthrough. I decided to keep the part of the branch to the left with the pine cones and tufts of pine needles, so I masked that too; laborious but worth it. Any thoughts on books or websites that can help me learn more about doing work like this? So many of them seem oriented toward photographers.

Thanks, I've added the picture. Is there something I can do with layers to temporarily block off the openings in the black border around the character? So that I could Flash Fill with a high tolerance without changing anything within that border?

I have an illustration from a century-old children's book. It's in color and it's a halftone, so the colors are all made from tiny dots. I want to remove the background colors (replace them with pure white) without making any changes to the animal character. The animal character is mostly, but not entirely, outlined in black. When I try flash fill with a low tolerance, it doesn't replace all the dots. If I go higher on the tolerance, then long before it replaces most of the dots it starts replacing color within the animal character. With the color replacement brush, it doesn't replace it with pure white; instead I get shades of gray dots instead of colored dots. I considered filling out the black outline of the character, but in places that would spoil the artistic effect. Any suggestions? I'm leaning toward the brush as that would allow me to leave the character's black border as is. But how do I get it give me plain white instead of gray dots? The black outline is thick enough that my idea is that replacement-brushing it that way would be easier than painstakingly painting pure white around the character. Any suggestions? BTW I'm new at this, not just to Affinity Photo but to work like this in general. Here's the crop from the illustration I'm working with: Spot_-_Chatterer_from_Twins_p149,_Color_1200,_raw,_rotate,_spot_crop,_BC-HC.TIF I want to keep the squirrel and the branch he's on, and remove the background sky color.