Re: [Gnuplot-info] Can't set background color in 4.2.5 on jpeg terminal

[Thomas S. <t.s...@fz...>]

i uploaded a patch on sourceforge yesterday which contains
your suggestion plus another correction (background color
of patterns):
http://sourceforge.net/tracker/?func=detail&aid=2809200&group_id=2055&atid=302055
(but for version 4.3 not for 4.2.x)


Perfect Thomas, thank you. Both gif and png terminals work.
Also the jpeg comment is right on.

Can I suggest that this is a bug in the jpeg terminal that I believe could
be fixed by
changing line 1360 in gd.trm (PNG_graphics()) from:

        rgb = gdImageColorAllocate(png_state.image, 255, 255, 255);

to
        rgb = png_state.rgb_table[0];
        rgb = gdImageColorAllocate(png_state.image, (rgb >> 16) & 0xff, (rgb
>> 8) & 0xff, rgb & 0xff);

The 'terminal jpeg' statement is loading the background color entry. Might
as well just use it instead of a fixed white color.


- Rod



Thomas Sefzick wrote:
> 
> has something to do with the fact that the gd-library
> sets the background to black for truecolor graphics.
> this is repaired by gnuplot's gd terminal by drawing
> a white background and then plotting over it.
> but the old mechnism for non-truecolor graphics (1st
> color is background color) doesn't work anymore.
> 
> 

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