imagemagick - python: wand autocompress monochromatic image on export. Any workaround? -


i'm working on tool cuts large image smaller tiles using imagemagick via python. , need tiles on same format (png, 8 or 16 bits).

in case, works fine, on monochromatic tiles imagemagick compresses picture on writing file. instance, pure black tiles compressed 1 bit picture.

i use plain save method, explained in the docs.

i found no documentation autocompressing feature nor way avoid this.

is there workaround or way can avoid happening?

edit:

for instance, if use code import 24bit rgb picture:

from wand.image import image  img = image(filename ='http://upload.wikimedia.org/wikipedia/commons/6/68/solid_black.png')  print img.type

i type

   bilevel

if add this, 

img.type = 'grayscale'  print img.type

once again get

bilevel

if try force pixel depth this, 

img.depth = 16  print img.type print img.depth

i get:

bilevel 16

i thought maybe changed depth, once save image, become 1 bit depth again.

so seems me imagemagick automatically compresses picture , have no control on it. refuses change image type.

any ideas avoid this? way force pixel depth?


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