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The image on the right below is the colorized version of the one on the left (GIMP was used). In my opinion, the colorized version looks fake because, for example, the borders of the three lollipops on the far left (yellow, red and green) look very sharp compared to the background.

enter image description here

Are there any sources for learning advanced colorization that overcome such problems, or can you suggest your own techniques here?

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    I beg to differ, the red one looks fake because the color is bleeding... – xenoid Aug 27 '17 at 17:18
  • @xenoid You mean the associated mask was not properly traced? Thanks. – Sabuncu Aug 27 '17 at 17:23
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    Perhaps. But some people would do that without a mask and just paint carefully with a tablet... The mask technique implies that there is one hard rule, but since every picture is different, eyeballing it also has its merits. In other words I'm not sure that you can ever make it look right (the initial picture isn't of very good quality), but you can certainly make it look good. – xenoid Aug 27 '17 at 17:28
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    The shadows are too dark. Normally, you would see some light get through the candy which is translucent. As shown, they are opaque: but, I can see the stick through the yellow and green one which is evidence that it's not opaque. – Stan Aug 27 '17 at 23:21
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    @Sabuncu To add to what PPs have pointed out, I don't see any color casting. i.e. I would think the red lollipop might create some red reflections in the top left part of the green lollipop... – curious Sep 1 '17 at 1:47
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Advanced colorization is Painting.

You can not achieve a good result playing only with the curves and not adding slight touches of changes in the hue.

On your case, the way to do that is to work in a high-resolution file, mask it properly and then export to a lower resolution image, so these imperfections are reduced.

Besides that, you need to paint colors on your image.

On this post, I explain how a gradient should have a slight twist on the hue to look more natural.

How can I make the color white look as white as possible?


On the comments on the original question, you were discussing the use of masks.

Masks are the proper way to handle this because they are reusable. You can use it in one step, and reuse it on another one, you can refine it later, without having to redo the work done in that layer.


One additional note. I can not emphasize more the need for a good quality source image.

The image you are posting has very flat ligting and is very low resolution.

Compare the detail on a better quality image, where the candy size is of a similar size (Click to enlarge):

enter image description here

(Candy image from pixabay.com)

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