imfuse: possible --background

[mviereck]

imfuse provides a lot of possible backgrounds.
From imfuse --help:

 --background BG      Specify a background to paint on. Default: mean
                      BG can be an image name or one out of:
                        enfuse
                        saturation
                        magick -list color
                        magick -list evaluate (compare --evaluate)
                        magick -list compose  (compare --compose)
                      Well to combine with --soft. Useable with --threshold.
                      Some recommendations: enfuse saturation mean max min
                      colorize colorize2 pinlight pinlight2
                      Interesting: interpolate overlay pegtoplight reflect2

Only some of them are really useable as background images. Others are interesting on themselves. Some are totally useless.
The script demo-imfuse-backgrounds generates a set of interesting results.

@holgerd001 Would you like to test this?

[holgerd001]

Would you like to test this?
It's still under progress.

[mviereck]

I've adjusted demo-imfuse-backgrounds to show interesting results only.
Also did some fixes in imfuse related to this.

[mviereck]

These backgrounds preserve background color at the best:

enfuse
saturation
max
mean
min
colorize
colorize2
pinlight
pinlight2

For black or white backgrounds some more compose modes are of interest.

imfuse --background=enfuse

imfuse --background=saturation

imfuse --background=max

imfuse --background=mean

imfuse --background=min

imfuse --background=colorize

imfuse --background=colorize2

imfuse --background=pinlight

imfuse --background=pinlight2

[holgerd001]

I've adjusted demo-imfuse-backgrounds to show interesting results only.
Also did some fixes in imfuse related to this.

I run demo-imfuse-backgrounds a second time, but I couldn't see a difference.
Imfuse is still v0.6.6.5-beta.

[mviereck]

I run demo-imfuse-backgrounds a second time, but I couldn't see a difference.

It won't overwrite already existing results. Changes should be visible for difference (previously transparent) and for multiply and freeze (previously black) where I found a bug.

Imfuse is still v0.6.6.5-beta.

Sometimes I forget to increase the version number, sorry.