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
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
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