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Changing object in picture to white

Dec 3, 2010, 03:20
Post: #1
Changing object in picture to white
New here at the forums and new to GIMP also. I'm trying to change an object's color to white in a photo I have, but have had no luck. I've been searching through tutorials and anything else I can find. Could someone please point me in the right direction? Thanks!
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Dec 3, 2010, 07:46
Post: #2
RE: Changing object in picture to white
Can you post a crop of the picture with the object?

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Dec 3, 2010, 17:16
Post: #3
RE: Changing object in picture to white
(Dec 3, 2010 07:46)ofnuts Wrote:  Can you post a crop of the picture with the object?

I'd like to see what my Mossberg would look like with a white receiver and white heat shield (above the barrel). I've tried creating a duplicate layer and adjusting the Hue/Saturation, but that doesn't work. I've also tried using the path tool on a new layer to trace out specifically what I would like white.


[Image: cimg0028m.th.jpg]
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Dec 7, 2010, 20:43 (This post was last modified: Dec 7, 2010 20:45 by ofnuts.)
Post: #4
RE: Changing object in picture to white
Sorry about the delay looks like my subscription to the thread didn't stick.

This is one hell of a difficult image, because you aren't changing a color but are changing black... The usual color change method doesn't work here. I used a different technique: plain white paint, but put the shadows back to keep the texture. The shadows are extracted with the curves tool, the gun is black but it's only moderate black and the shadows are a deeper black. So duplicate the base layer, and in the curve tool, keep a small 45 degree slope in the deem blacks, then brutally go to full white for the rest of the values. Once you get only the shadows, use Color/Color to alpha on the white to replace the white by transparency. ou can also use Color/Desaturate on your shadows to reduce chromatic noise. Then insert a layer between the original layer and the shadows, and paint in white. You can adjust the transparency of the shadows.

I didn't get that far but with a similar idea you may be able to extracts the shiny bits (slightly lighter black), and if you didn't use pure white, use that to obtain slightly whiter spots..

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Dec 7, 2010, 20:49
Post: #5
RE: Changing object in picture to white
Forgot to attach a quick and dirty test:[attachment=84]

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