tone mapping

Cheap HDR

theilr — Thu, 12 Nov 2009 05:05:32 +0100

Provides a kind of poor-man's HDR (high dynamic range). It doesn't actually increase the dynamic range; in fact, it decreases it, overall, but in a way that maintains local contrast. But this gives you some headroom to increase the contrast of the image overall, thus enhancing the local contrast.

Advanced Tone Mapping

tasuki — Sun, 15 Jun 2008 16:19:07 +0200

Based on Tone mapping script. If you want to see some examples of what my script does, please read my blog post about the Advanced Tone Mapping script.

There are four parameters for Advanced Tone Mapping script: Gaussian blur, Opacity of blurred layer, Opacity of Merged layer, Copies of merged layer:

Gauss. Blur (% of img size) — is the amount saying how much the blurring should be used for the tone mapping. It is in percents of image size (where image size = (width+height)/2). Ten is a good default, but different values might be interesting too.
Opacity of blurred layer — this is the 75 default, which can be changed if you want stronger or weaker effect.
Opacity of merged layer — the default is 90. If 100 is not enough, consider increasing number of “copies of merged layer”.
Copies of merged layer — when one, it’s barely noticeable, you can deny any accusations of postprocessing easily. :) Three has a lot of “halo effect” and anything above five will completely mess all colours up.

Opinions and suggestions for improvement are welcome!

Relative color remap

larsrc — Tue, 03 Jun 2008 13:22:55 +0200

This plug-in changes colors in an image based on the HSV difference between two colors. This is particularly useful for applying color themes to existing images.
It avoids burning out high saturation and value at the expense of compression them somewhat when the difference goes towards higher saturation and value.
Current bugs/missing features include:
Undo does not work.
It can't be used on indexed images, even though it would frequently have enough colors.
It's slooow. Since it looks at only one pixel at a time, it should use some "pixel-iterator" that goes through the tiles in an optimal manner.
Selection only works in binary.
Grayscale support is untested and probably broken.
There is no preview.
Prevention of highlight burnout should be optional.

Tone mapping

tuxcomputers — Tue, 13 May 2008 03:51:30 +0200

It reduces global contrast in images while increasing local contrast and shadow/highlight detail. Use this to make your images "pop."