Re: [NTG-context] colorizing pictures

On 3/19/2019 4:23 PM, Henning Hraban Ramm wrote:

Am 2019-03-19 um 13:23 schrieb Hans Hagen :

...

On 3/18/2019 7:45 PM, Henning Hraban Ramm wrote: from one of the manuals ...

\starttext

\definecolor [my-blue] [c=1,m=.38,y=0,k=.64] % pms 2965 uncoated m \definecolor [my-yellow] [c=0,m=.28,y=1,k=.06] % pms 124 uncoated m

\definespotcolor [my-blue-100] [my-blue] [p=1] \definespotcolor [my-yellow-100] [my-yellow] [p=1] \definespotcolor [my-blue-50] [my-blue] [p=.5] \definespotcolor [my-yellow-50] [my-yellow] [p=.5]

\definemultitonecolor [my-mix] [my-blue=.12,my-yellow=.28] [c=.1,m=.1,y=.3,k=.1]

So it works only with toned or multitone colors and only with _some_ greyscale pictures, not with bitmaps and also not with my greyscale dodo.

It uses an indexed (256 so one byte) image ... coloring a cow is no option anyway as there the pdf object is an independent thing (i coul dprobably inject color directives if needed but that could then interfere with the way such a pdf stream is set up.

I can also only use one version my-blue – if I use my-blue-100, then my-blue-50 stays grey, and if I only use my-blue-50, it’s the same tone as 100.

Something’s very fishy. Could be but it's actually more a gimmick as we can't really mess to much with the internals of images (they can have masks, palettes, etc etc).

Later this year there might be other tricks on our sleeves but I'm not going to touch the code now. Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl -----------------------------------------------------------------