Recoloring Green to Red

[wierdbeard65]

Hi,

I have some icons in PNG format which are basically green (with some grey shadows). Unfortunately, I need them in red!

Sample:



The icons all have graduated fills and have a transparent background. I'm banging my head against the wall trying to figure out the appropriate way to do this. A lot of the methods I have found result in a black background (instead of transparent) or mess up the shading.

Can anyone offer me advice on how to achieve this?

TIA

ImageMagick-6.9.2-3-Q16-x64

[fmw42]

Your image link is broken. We would need to see your image, to give a good response.

[wierdbeard65]

Thanks. (Crazy quick reply, BTW, wow!!!!)
Odd, I uploaded to dropbox, as suggested, and then put link in IMG tags. Here is the link sans-tags.

https://www.dropbox.com/s/l1kefl43e8sqg ... n.png?dl=0

Thanks again!

[fmw42]

Try

Code: Select all

convert Computer-Green.png -modulate 100,100,40 result_red.png

Change the 40 as desired for the resulting color. see http://www.imagemagick.org/Usage/color_mods/#modulate

[wierdbeard65]

You, Sir, are a Genius!

Thank you so much, EXACTLY what I needed. (I have to be honest, I'd found that reference, but didn't understand it as I'm not a color technician.)

[fmw42]

It would have been better perhaps if the hue values were in degrees rather than the range of 0 to 200 with 100 being no change. But one can convert degrees to the needed range if need be. That way one can use a colorwheel and see how much degree change is needed or one could make a colorwheel that is labeled with the IM range. See http://www.fmwconcepts.com/imagemagick/ ... _chart.jpg