On 2015-10-14 08:36 (+0200), Enno R. Oldewurtel wrote:
> When I import an eps that contains a bitmap (e.g. an eps generated from
> a MATLAB figure, that also has an image displayed), the bitmap in the
> imported form does not show the original pixels anymore but suffers from
> compression artefacts. These artefacts are not very visible for large
> image with small pixels relative to the total image size.
>
> However, I often need to display zoomed regions of microscopy image,
> where those compressions are having quite a detrimental effect on the
> import. As an example I created a MATLAB figure with 10x10 random
> pixels. I attach the svg file where I imported the MATLAB figure after
> saving it as a PNG within MATLAB and another import of the eps file that
> I saved with MATLAB. The artefacts are clearly visible. ;)
>
> Most times the compression is probably great to reduce overall file
> size, but in occasions like the ones described above it would be great
> to have a different or no compression of the bitmaps during import.
See the discussion e.g. in the comments of this report:
* “Interpolation while viewing in-file bitmap image”
https://bugs.launchpad.net/inkscape/+bug/1418038
It should cover the new rendering options for bitmap images in Inkscape
0.91, both when importing a bitmap image directly, as well as when
importing foreign vector formats with embedded bitmap data.
As workaround for bitmap images embedded in imported EPS/PS files in
Inkscape 0.91, you can install and use the extension attached to this
report:
* https://bugs.launchpad.net/inkscape/+bug/1357808
(The extension will be available as 'Extensions > Images > Set Image
Attributes'; just enable "[x] Render images blocky" on the 'Basic' tab,
and apply)
Also related (see comments 11 and 12):
* “discrete color scale bitmap becomes continuous object after eps/pdf
export”
https://bugs.launchpad.net/inkscape/+bug/1174651
hth, V
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