On Fri, Jul 21, 2017 at 04:19:02PM +1000, Erik Christiansen wrote:
On 20.07.17 19:51, Pol Hallen wrote:From client I print (ie: a 300Kb of pdf), in log cups server I see that file size about 4/5Mb (why?), so the printer before print it I've to wait also 15 minutes :-/Is the file for the printer postscript? That is always bigger than the pdf equivalent, even before you get to the fancy compression of images that Gene mentions. A printer with a slow processor can take many minutes to process large volumes of postscript. I have a small HP 3-in-1 laserprinter, and it can be slow. I don't remember how PCL5 compares to postscript for speed.
That's because Postscript isn't an image format, it's a drawing language. For example, this fairly simple looking postscript file [1] will use the printer's postscript engine to calculate a full-page Mandelbrot fractal. Some printers can take *hours* to perform all the necessary calculations required to render the page. [1] https://gist.github.com/dln/bc88911f6bf8e55856d9
This happens only with a client with debian testing (and latest update of cups) before this updates no problem.That may be "why", but the file format will elucidate "how", which is the technically revealing bit. Erik
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