Command-line option '-renderimage 256' does not generate indexed output

[trathborne]

xaos -size 256x256 -renderimage 256 -render test.xpf gets me a 24-bit RGB PNG, not an 8-bit indexed PNG as expected.

test.xpf contains:

(initstate)
(palette 3 860056513 20)
(formula 'mandel)
(maxiter 1048576)
(view -0.81313450604373665656 0.20321523243328790589 1.1899675849947772013E-17 1.1899675849947772157E-17)

I would like to make an indexed image so that I can play around with the palette in post-processing.

Hmm ... I guess I could just make a 256-gray-level gradient palette, and hack the PNG to apply a palette... but... maybe I am just doing something wrong. Please advise me!

[trathborne]

I also tried with (filter 'palette #t) in there ... and various other combinations.

[kanurag94]

@trathborne Can you please redirect me to the output you expected with respect to what you got? I want to take up this issue, and it would be helpful. Thanks

[trathborne]

I expect a 'PseudoClass 256c' (indexed color, 256 colors with a palette) image and instead got a 'DirectClass 8-bit' (8 bits per channel, 24-bit RGB) image.

It looks like it worked as of less than a year ago ... see below:

$ ls -l fract12.png fract14.png
-rw-r--r-- 1 tomr tomr  15350282 Nov  1  2019 fract12.png
-rw-rw-r-- 1 tomr tomr 642428473 Aug 27 19:46 fract14.png
$ gm identify fract12.png fract14.png
fract12.png PNG 7680x4320+0+0 PseudoClass 256c 8-bit 14.6Mi
fract14.png PNG 18312x27040+0+0 DirectClass 8-bit 612.7Mi

I know the handling of indexed color changed over the past year ... maybe something was lost!

Thanks!