On Thursday 27 July 2006 8:33 am, JIM MacDonald wrote: > Hi, > > I've just moved from MATLAB to matplotlib, and I'm really impressed > with the quality of the PS figures it generates with usetex and the > xpdf distiller.
Glad to hear it. > I've hit a couple of problems though [...] > The first problem I noticed is that the distilling process was causing > some of my images to have (lossy) compression applied and others not. > It turns out that it is a feature of ps2pdf that it tries to detect > the content of the image and apply appropriate compression. You can > over ride this distiller options. My patch adds a new rc option > ps.image_compression that can be set to auto (preserves the current > behaviour), DCTEncode (applies lossy JPEG compression), and > FlateEncode (lossless compression). The distiller commands are > embedded in the ps file. I looked at making it a flag on each image, > but couldn't get it to work. Another way to do it is to pass extra > command line options to ps2pdf (-dAutoFilterColorImages=false > -sColorImageFilter=FlateEncode should do it for colour images). I > thought embedding it in the PS file would be more flexible. I'll look into this soon. I'm hesitant to add another rc option, maybe we can consider using these settings as the defaults. I'll post again after I have had a chance to play with it. > My second problem involved the resolutions of the image. I'd like to > preserve the resolution of my image in the PS output, but I can't > figure out how to stop the image being resized and interpolated. > Obviously you need to do this for the bitmap backends, but for vector > ones surely you can just scale the original image in the vector > output. The resolution for Postscript is 72 dpi, and I'm not sure this can be changed. Would you send me an example postscript file along with the original png? ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Matplotlib-devel mailing list Matplotlib-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
