XnView Software

thanks Drahken,
you mainly pointed out the solution XnTriq suggested.
of course it's very tedious interactively pixel by pixel,
but with a little perl script I am able to also re-assign rgb-ranges.
now I can even do it entirely on my good old iMac.
(both, CF & Paintshop palette, worked fine for ...

okay, let me re-phrase:

I highly appreciate and admire people like pierre , and especially the free spirit , they are following and living.
being retired by now, I was considering myself to join the freeware /open source community, however, with my skills,
it didn't really work for me. so I ...

hi everybody,

the colleagues from "imageJ" provide a macro/formula UI, where you may enter manipulation formulas for the image
e.g. for the pixel value "v" a formula like this: if ((v>99) && (v<200)) v=v/2+155
- the result "v" is automatically truncated to 0 ... 255.
- this UI also handles other ...

thanks XnTriq for your solution,
so you also didn't find a simple UI solution in xnview

meanwhile, I found a tool myself, that can solve my intention a bit easier, but unfortunately not on my old iMac G5. I had to
switch to (sorry) windows (7). "imageJ" does it in a few steps:
1.) Image -> Color ...

hi everybody,

in a gray-scale image, how to change the pixels, that are brighter/higher than e.g. rgb(180,180,180) to more red, e.g. rgb(240,140,140) ?

so I want to keep the darker gray pixels e.g. rgb(070,070,070) as is, but for the brighter ones increase red, and/or decrease green and blue
once ...