Problems with ConvertToMonitorRGB and ConvertForDisplay

hello,

 

i working on photoshop plug-in artivity (http://artivity.io/). goal capture data of creative process.

additionally pure metadata, want capture small renderings of changed layer png.

the main plug-in implemented automation plug-in, works fine.

on changes export plug-in triggered supposed write layer png.

i tried different methods haven't found 1 works.

 

first tried using png export of photoshop. required me change state of document (hide layers) , takes way long. additionally image not scaled down.

 

my next approach use readpixelsfromlevel() gave me scaled down representation of layer exportrecord::documentinfo::layersdescriptor

this means don't have worry scaling, awesome! saved images pngs boost::gil (something hope can in thread, have not tried yet).

for rgb8 images worked reasonably well.

when started implement same mechanism cmyk8 ran number of issues.

converting boost::gil resulted in vastly different image because didn't account colour profiles.

 

i tried convert cmyk image pscolorspacesuite2::converttomonitorrgb() find out takes int16 count parameter.

this means means function can convert 32767 byte in 1 call. needed call function multiple times.

well result looks fine performance bad solution not acceptable.

 

now hope find here.

is possible call pscolorspacesuite2::converttomonitorrgb() in different thread? time takes complete wouldn't bother me if it's not in ui thread.

would faster if call once? why count int16?

i tried using pscolorspacesuite2::convertfordisplay there no examples function , documentation bit ambiguous didn't far. managed kspbadparametererrors. function faster converttomonitorrgb()? worth trying out?

 

what other options have? need colour correction myself?

 

thank in advance,

moritz eberl

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