discrete color scale object becomes continuous in eps export
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
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-continu... Sent from the Inkscape - User mailing list archive at Nabble.com.
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
-- View this message in context: http://inkscape.13.x6.nabble.com/discrete-color-scale-object-becomes-continu... Sent from the Inkscape - User mailing list archive at Nabble.com.
Try New Relic Now & We'll Send You this Cool Shirt New Relic is the only SaaS-based application performance monitoring service that delivers powerful full stack analytics. Optimize and monitor your browser, app, & servers with just a few lines of code. Try New Relic and get this awesome Nerd Life shirt! http://p.sf.net/sfu/newrelic_d2d_apr _______________________________________________ Inkscape-user mailing list Inkscape-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/inkscape-user
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
-- View this message in context: http://inkscape.13.x6.nabble.com/discrete-color-scale-object-becomes-continu... Sent from the Inkscape - User mailing list archive at Nabble.com.
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
participants (2)
-
unknown＠example.com -
alvinpenner