I did play around with trying to find a "match colour" method a few months ago. Worked well for this pic but not so sure after trying it out with others. I thought the Gimp might do better at matching colours if not having to worry about luminance at the same time. Then in step 6 I went back to the original pic for the original luminance. So what step did you do different for that result?īefore starting I removed the luminance information from both pics by decomposing, setting Y channels to gray, and recomposing. wondering if this is a better result?Īt first I couldn't tell what the difference was, then I noticed the skin had more saturation. I then create the script step by step checking each step as I go. Right, I always do the steps manually first to ensure they are all there and work as expected. got to go back to RGB before you can decompose. I tried following your steps last night and decompose is not an option if the image is an indexed one. Tuxcomputers Can you confirm that you missed a step of converting the image back to RGB between steps 3 and 4? Rore (a group admin) edited this topic ages ago. This is rather interesting, but It does not look really good to me - at least on that example, especially on the woman face that turned greenish. I have not checked the group lately and have only just noticed this, I have another script to do and will give this one a go as well in the next day or so. Somebody here knows Peter Kirchgessner, who wrote the decompose plug-in a ten years ago? Maybe it is possible to integrate this procedure into that plug-in. I see the decompose plug-in creates layers with a localized name, so this makes the things even more difficult. The tricky part will be to deal with various image and layer names. paste the blue layer of PLT_470 over the blue layer of IMG_470 paste the red layer of PLT_470 over the red layer of IMG_470 get the name of the new image (supposedly IMG_470) decompose IMG, mode YCbCr_ITU_R470 with layers get the name of the new image (supposedly PLT_470) decompose PLT, mode YCbCr_ITU_R470 with layers convert PLT to indexed color mode, 256 colors optimum (with or without dithering?) I'd try to script it, if someone can give a little help. In step 4 you need to set the mode back to RGB before it will allow you to decompose. I am always very appreciative of those who post tutorials / how-to's. right a script will be handy is a cool effect.īut about script and codes all i can do for help is just a added bump The most convenient place to put it might be a script :) I've seen techniques to give an "Impressionist" look to photographs (don't recall what they were though), but to be able to use the same colours sounds really cool. Wondering if this shouldn't go on a wiki somewhere. This combines the colour information from the nasty step-3 picture with the luma information from the original picture. STEP 9: go to Image->Mode->Compose and select YCbCr_ITU_R470 again. STEP 8: Blur both of the new colour layers a bit. STEP 7: Copy the two colour layers from the other picture (ie the picture made in step 4) into the picture being modified. STEP 6: Delete the two colour layers (redness/blueness) from the picture you want to modify, leaving just the luma layer. STEP 5: Repeat step 4 on the picture you want to modify. The third layer looks more normal because it encodes the luminance of the image. Two of the layers look a bit weird, because they encode the colour content of the image. This gets you a 3 layer 'monochrome' picture. STEP 4: Flatten the image and then go to Image->Mode->Decompose and select YCbCr_ITU_R470, having ticked "decompose to layers". Here's what this gets us: A really really shoddy version of what we're actually looking for: The Gimp has no choice but to render your image in the 256 colours it got from the old master. (You can do this by dragging the thumbnail from the layers menu). STEP 3: Copy the image you want to modify as a new layer into the old master. STEP 2: Change your old master to indexed colour mode, 256 colours, with optimum palette. (Doesn't matter about the aspect ratio, its the colours we're after not the image). STEP 1: Resize your old master to the same size as the picture you want to modify. This is loooooooong winded, hence a new thread, but I've got a method for:
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