> Actually, my 720dpi printer should be able to manage 180dpi in colour
>pixels. I am not sure if I have achieved this yet. XV has another
>limitation. When you import a file whose resolution is in excess of the
>computer screen resolution, it reduces the number of pixels. If you use
>xpcd to capture a 3072x2048 image, XV will convert to TIFF at 1024x768. I
>should be able to print a 1536x1024 image, at 720(180)dpi, but I haven't
>quite figured this out yet. This is one of my projects for the Christmas
>holidays.
Firstly, the size of the XV window doesn't mean the image has to be the
same size. You can save a larger-than-screen-size image by clicking the
`normal size' checkbox in the XV save dialog. Also, if you start XV with
`xv -nolimits' it won't attempt to shrink the image to screen size. The
X server might crash if you try to view too large an image, though :-(
> I have used hpcdtoppm to generate a `Floyd-Steinburg' dithered image at
>720dpi, which I imported into a LaTeX file. I then compiled and printed
I think you are right to use Floyd-Steinberg as this seems to give the best-
looking image on printers which only have on/off colour capability. I'm
not sure, though, what the effective resolution of a Floyd-Steinberg-dithered
print is. Seems better than 72dpi if you start with a 300dpi raster. I
only have a bw printer, but I tend to find myself using XV to turn large
colour images to bw PostScript, where XV uses Floyd-Steinberg to make up the
bw bitmap, and then printing at 300dpi. If you have enough memory to go to
600dpi the images are quite good.
Paul.
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