Differences

This shows you the differences between two versions of the page.

--- images [2016/03/02 15:19]
christian [Implementation]
+++ images [2016/09/24 08:15]
dokuadmin ↷ Links adapted because of a move operation
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-In PDF images are defined by the number of bits per color component (1, 2, 4, 8 or 16 bit). The colorspace defines the number of components and their layout for a pixel. Any colorspace permitted in PDF can be used (see [[Colors]]). For images converted from Smalltalk, only ''/DeviceRGB'' (3 components), ''/DeviceGray'' (1 component) and ''/Indexed'' (1 component) are relevant. The ''/Indexed'' colorspace in PDF can only hold up to 255 colors.
+In PDF images are defined by the number of bits per color component (1, 2, 4, 8 or 16 bit). The colorspace defines the number of components and their layout for a pixel. Any colorspace permitted in PDF can be used (see [[:colors]]). For images converted from Smalltalk, only ''/DeviceRGB'' (3 components), ''/DeviceGray'' (1 component) and ''/Indexed'' (1 component) are relevant. The ''/Indexed'' colorspace in PDF can only hold up to 255 colors.
 A ''PDF.ImageXObject'' is a stream whose contents is a byte string with the pixel bits. A row ends at the byte boundary. A row with one pixel with 3 components of 1 bits (= 3 bits), uses 1 byte (8 bit) for the row. As any stream, ImageXObjects can be compressed using filters. By default, ''/FlateDecode'' (zip) is used.