On 04/11/2012 12:46 PM, Keith Purtell wrote:

This is another of those things I knew how to do in PShop and am now trying to duplicate in GIMP. I have a photo of a flowchart drawn in green marker on a whiteboard. Photo taken with an iPhone, so quality is yuck. I brought out the greens with Color Enhance, but now the white board has areas that are yellow on the right and blue on the left.

How to target these "problem colors" and desaturate or otherwise move them back to white?

Hey Keith,

The Select By Color tool might do the trick for you - it's a button in the top row of the (default) main toolbox. Turn it on, click in an "average looking" part of the unwanted color anywhere in the image, and see how close it comes to getting everything you want to alter. In the Tool Options dialog dock, you can adjust the threshold of this tool to select a wider or narrower range of colors, image-wide.

Once you have (only) the bits you want to change selected, you can do any of a number of things: Drag and drop your color of choice from the foreground/background tool, use the Colors > Hue/Saturation tool, or etc.

:o)

Steve

Good day, Keith!

Could you show an example? For some reason I have a feeling that there is more than one way to accomplish this.

Best regards, Boris

2012/4/11 Keith Purtell

This is another of those things I knew how to do in PShop and am now trying to duplicate in GIMP. I have a photo of a flowchart drawn in green marker on a whiteboard. Photo taken with an iPhone, so quality is yuck. I brought out the greens with Color Enhance, but now the white board has areas that are yellow on the right and blue on the left.

How to target these "problem colors" and desaturate or otherwise move them back to white?

Keith

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[Gimp-user] How to control one color only? Message-ID:

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Keith the way I'd do it to keep things simple and quick is to create a selection of the troubling area, begin by creating a duplicate layer first then select (on the duplicate) as close the pixels as possible the area you need, create a new path from this selection incase you need to reselect later on.

Select area can then be adjust to what ever you need. Saturation, hue, contrast or even bluring.

To blend the changes to the rest of the image pixels a slight blur using the blur tool work well for me, starting with the slightest of opacity and blur. Ctrl+Z is my friend in this case.

Hope it helps you :)