However has anyone else but me noticed that Export to Bitmap doesn't really work?

I only ask this because I am making a poster, and it costs a good amount of money to print one of these suckers, I'd like to make sure that I'm going to get what I expect first.

Could someone explain what's going on here?

bulia byak wrote: > On 7/11/06, Jasper van de Gronde <th.v.d.gronde@...226...> wrote: >> Could someone explain what's going on here? > > No, unless you provide a sample file and detailed explanations, best > of all in the form of a bug report. Well, I had hoped someone would simply say "yeah, sure, of course the export to bitmap function has a slightly different output, ...", but I guess that's not the case. But before actually filing a bug report I would like to have it confirmed that it actually is a bug, as I can think of reasons why export to bitmap might produce different outputs (I could imagine some sort of caching is used for on-screen display for example, which might change the order in which the different objects are composited). Anyway, have a look at the following two images: http://home.hccnet.nl/th.v.d.gronde/gradient-test-new.png http://home.hccnet.nl/th.v.d.gronde/gradient-test-screenshot.png They both come from the same version of Inkscape (the modified one I just posted about in another e-mail, but 0.44 has the exact same issue) and show the same file on the same scale, yet the banding and coloring are slightly different.

Bryce Harrington wrote: > On Tue, Jul 11, 2006 at 07:29:13PM +0200, Jasper van de Gronde wrote: >> bulia byak wrote: >>> On 7/11/06, Jasper van de Gronde <th.v.d.gronde@...226...> wrote: >> ... >> http://home.hccnet.nl/th.v.d.gronde/gradient-test-new.png >> http://home.hccnet.nl/th.v.d.gronde/gradient-test-screenshot.png >> >> They both come from the same version of Inkscape (the modified one I >> just posted about in another e-mail, but 0.44 has the exact same issue) >> and show the same file on the same scale, yet the banding and coloring >> are slightly different. > > Oh, I think I see what's going on. Inkscape has a defined "canvas > area", as indicated by the document outline thingee. Anything > overlapping or extending beyond that box is clipped when you export. > In your screenshot it's clear you can see there is portions of the > document extending beyond this boundary; it looks like inside the > boundary everything is identical for both images. This is weird! When looking at the images with Firefox they indeed appear to be (virtually) identical (apart from the border of course, I just clipped a bit rough), but when I look at images with IrfanView (or Corel PhotoPaint, I didn't try any other programs) they seem to be different... (In fact, to make sure I wasn't going crazy I checked the histograms, after cropping properly naturally, the mean value is off by about 10.) Any gamma values or something similar being written to the PNG file? I'm using a color profile for my monitor btw, but I don't think that should matter in this case (should affect both images in the same way when displaying them and shouldn't be affecting the RGB values reported for the image).

Jasper van de Gronde wrote: > This is weird! When looking at the images with Firefox they indeed > appear to be (virtually) identical (apart from the border of course, I > just clipped a bit rough), but when I look at images with IrfanView (or > Corel PhotoPaint, I didn't try any other programs) they seem to be > different... To (hopefully) illustrate what I mean I've uploaded a screenshot of gradient-test-new shown from within IrfanView as well as Firefox (so to be absolutely clear, you're looking at the exact same image twice, one that was generated with export to bitmap): http://home.hccnet.nl/th.v.d.gronde/gradient-test-screenshot2.png

Wait a second... it looks like there's transparency involved in the object the gradient is applied to and the canvas is most likely transparent as well... is this possibly the issue with the PNG export? In Inkscape it will render on the white (transparent) background, but, the PNG would just have transparency w/o that "artificial" white. I guess the quick test is to make the background opaque in the document properties and test exporting to PNG again.

Joshua A. Andler wrote: > ... > Wait a second... it looks like there's transparency involved in the > object the gradient is applied to and the canvas is most likely > transparent as well... is this possibly the issue with the PNG export? > > In Inkscape it will render on the white (transparent) background, but, > the PNG would just have transparency w/o that "artificial" white. I > guess the quick test is to make the background opaque in the document > properties and test exporting to PNG again. That was it. After making the background opaque the exported bitmap displayed exactly the same in IrfanView as the original in Inkscape. ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&... _______________________________________________ Inkscape-user mailing list Inkscape-user(a)lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/inkscape-user

Outside of Inkscape I was just viewing a PNG file. The "problem" was that Inkscape treats the transparency of the background slightly different when exporting then when rendering to screen (and with good cause I might add). On-screen a background necessarily has some opaque color (well, theoretically Inkscape might be able to make the background transparent, but I doubt anyone would appreciate that), when exporting this doesn't have to be the case. And apparently IrfanView simply discards the alpha channel or something, so if anything it's probably a problem with IrfanView and not Inkscape.

Bryce Harrington wrote: > On Tue, Jul 11, 2006 at 07:29:13PM +0200, Jasper van de Gronde wrote: >> bulia byak wrote: >>> On 7/11/06, Jasper van de Gronde <th.v.d.gronde@...226...> wrote: >> ... >> http://home.hccnet.nl/th.v.d.gronde/gradient-test-new.png >> http://home.hccnet.nl/th.v.d.gronde/gradient-test-screenshot.png >> >> They both come from the same version of Inkscape (the modified one I >> just posted about in another e-mail, but 0.44 has the exact same issue) >> and show the same file on the same scale, yet the banding and coloring >> are slightly different. > > Oh, I think I see what's going on. Inkscape has a defined "canvas > area", as indicated by the document outline thingee. Anything > overlapping or extending beyond that box is clipped when you export. > In your screenshot it's clear you can see there is portions of the > document extending beyond this boundary; it looks like inside the > boundary everything is identical for both images. This is weird! When looking at the images with Firefox they indeed appear to be (virtually) identical (apart from the border of course, I just clipped a bit rough), but when I look at images with IrfanView (or Corel PhotoPaint, I didn't try any other programs) they seem to be different... (In fact, to make sure I wasn't going crazy I checked the histograms, after cropping properly naturally, the mean value is off by about 10.) Any gamma values or something similar being written to the PNG file?