Large graphics cause bars
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#76 Large graphics cause bars
I have trouble printing large images with the SAMSUNG ML-1410. The height of the picture is right but it has either wihte or 'greyed' bars in the print. The easiest way for me to test is using xsane to make a copy of an A4 paper, e.g. a business letter. I tried to copy the graphics into an open office document to print, but the problem persists. I tried to print with the Ubuntu 7.10 live CD, the bars look a bit different but the problem persits. Printing documents with texts and small graphics works well.
During my internet research I read that the printer should have a 64K barrier. Large graphics might exceed it?
The resolution 300 or 600 dpi seem to have some influence, 600 dpi works better but not without errors.
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Correct. This driver emits a print language which supports compressed bands at most 64KB in size. Unfortunately some graphics-heavy or otherwise high frequency content tends to compress to sizees larger than that, so they just can't be printed using the Samsung-provided code.
I put in a hack that makes it print anyway; basically it blurs the band repeatedly until the compressor produces a result that fits. This makes all pages print. Arguably this is better than pages that abort printing in the middle (it used to hang the printer!), but it certainly isn't very satisfactory, not in my book...
There's a newer free Samsung driver out there (called "splix" or something like that), but I don't know if it supports the 1410. There is also a binary-only driver distributed by Samsung. It's possible that either or both of these use a different print language to drive the printer, one which might not be subject to the awkard 64KB band flaw of the smartgdi driver. It's also likely that there is some undocumented alternate way to print to these "smartgdi" devices not subject to the 64KB banding issue, but afaik nobody outside of Samsung knows about it.