12:04 p.m.
dear all,
I have a inkscape problem that I do not understand. An object
showing a discrete color scale is converted to a continuous scale in the
eps export.
here is the example file
http://www.climate.unibe.ch/~muthers/exchange/drawing.svg
this is the exported file
http://www.climate.unibe.ch/~muthers/exchange/drawing.eps
any help is appreciated!
inkscape version is 0.48.4 on arch linux.
cheers,
stefan
12:54 p.m.
New subject: discrete color scale object becomes continuous in eps export
I don't know much about bitmaps, so you may get a better answer from someone
else, however here are a few comments. The problem appears to be related to
the fact that this was originally an embedded png image. The size of the
image was 1 pixel by 1 pixel. This is shown in the svg tag
<image width="1" height="1"
transform="matrix(1,0,0,-1,0,1)"
xlink:href="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA4AAAABCAYAAADuHp8EAAAABHNCSVQICAgIfAhkiAAAAERJREFUCJkBOQDG/wG2aij/FxsXABQgJQAUKCAAABMaAAoVHAAACkUAAAAAAM4AzgDM8eUAus3tABvtKQCXxugA/cioAGJcEJMX3vuCAAAAAElFTkSuQmCC"
id="image20862" />
Then the image was expanded by a factor of 465 horizontally and 25
vertically. This is shown in the element
transform="matrix(465.32309,0,0,25.338759,163.05532,330.72791)"
During this expansion, Inkscape chose to interpret the color gradations in a
discrete way as 14 separate colors, while the postscript file apparently
interpreted these as a continuous color scale. I think the Inkscape
interpretation is probably the correct one; however, the way to avoid this
in the future would be to import a full size png image that does not need to
be scaled.
cheers,
Alvin Penner
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2:01 p.m.
New subject: discrete color scale object becomes continuous in eps export
hi Alvin,
thank you for your comprehensive explanation!
The color scale stems from a PDF file produced with ncl[1]:
http://www.climate.unibe.ch/~muthers/exchange/nclplot.pdf
I tried several PDF viewers, in any case the color scale was displayed
in the correct way. Therefore I would expect the same after importing
(File->Import) and exporting it (to eps or pdf) using inkscape.
It this maybe a inkscape bug?
As a workaround I found that I can export the color scale as bitmap and
then re-import it into inkscape. After this, the exported eps looks the
way I expect it to be.
cheers,
stefan
[1] http://www.ncl.ucar.edu/
On Mon, Apr 29, 2013 at 12:54:03PM -0700, alvinpenner wrote:
I don't know much about bitmaps, so you may get a better answer
from someone
else, however here are a few comments. The problem appears to be related to
the fact that this was originally an embedded png image. The size of the
image was 1 pixel by 1 pixel. This is shown in the svg tag
<image width="1" height="1"
transform="matrix(1,0,0,-1,0,1)"
xlink:href="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA4AAAABCAYAAADuHp8EAAAABHNCSVQICAgIfAhkiAAAAERJREFUCJkBOQDG/wG2aij/FxsXABQgJQAUKCAAABMaAAoVHAAACkUAAAAAAM4AzgDM8eUAus3tABvtKQCXxugA/cioAGJcEJMX3vuCAAAAAElFTkSuQmCC"
id="image20862" />
Then the image was expanded by a factor of 465 horizontally and 25
vertically. This is shown in the element
transform="matrix(465.32309,0,0,25.338759,163.05532,330.72791)"
During this expansion, Inkscape chose to interpret the color gradations in a
discrete way as 14 separate colors, while the postscript file apparently
interpreted these as a continuous color scale. I think the Inkscape
interpretation is probably the correct one; however, the way to avoid this
in the future would be to import a full size png image that does not need to
be scaled.
cheers,
Alvin Penner
--
View this message in context:
http://inkscape.13.x6.nabble.com/discrete-color-scale-object-becomes-cont...
Sent from the Inkscape - User mailing list archive at Nabble.com.
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4:14 p.m.
New subject: discrete color scale object becomes continuous in eps export
yes, it looks as if this is probably an Inkscape bug. I loaded the file
nclplot.pdf into Inkscape and got the same result as you got, namely an
image of size 1 pixel by 1 pixel.
Then, just for curiosity, I used Ghostscript to do a direct conversion from
.pdf to .ps without using Inkscape at all. The command I used was:
pdf2ps nclplot.pdf ncltest.ps
This gave me the attached .ps file, which appears to be identical to the
original pdf file. ncltest.ps
<http://inkscape.13.x6.nabble.com/file/n4966775/ncltest.ps>
So it is likely that the conversion error was caused by scaling performed by
Inkscape.
Alvin
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2:26 a.m.
New subject: discrete color scale object becomes continuous in eps export
On Mon, Apr 29, 2013 at 04:14:17PM -0700, alvinpenner wrote:
yes, it looks as if this is probably an Inkscape bug.
I reported this as a bug, lets see what happens.
https://bugs.launchpad.net/bugs/1174651
cheers and thanks again,
stefan
3866
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