Bug 690664

Summary:	PDF file does not display on the screen
Product:	Ghostscript	Reporter:	Till Kamppeter <till.kamppeter>
Component:	X Display Driver	Assignee:	Michael Vrhel <michael.vrhel>
Status:	RESOLVED FIXED
Severity:	major	CC:	christinedelight.top85
Priority:	P4	Keywords:	bountiable
Version:	8.70
Hardware:	PC
OS:	Linux
Customer:		Word Size:	---

Description Till Kamppeter 2009-07-29 02:24:10 UTC

The PDF file invoice-reduced.pdf, attached to bug 690189 does not display on the
screen with Ghostscript 8.70. What gets shown is simply a blank page. All other
output devices (for example "png16m") handle the file correctly (therefore bug
690189 is fixed).

Comment 1 Ken Sharp 2009-07-29 06:14:45 UTC

Hmm, my results are different, but also incorrect. I tried it here on my Fedora
setup and it does display, but colours are inverted. That is, the image is
mostly black with white text....

I then selected the tiff24nc device, and got the same result. tried pbmraw, same
result, tried png16m, same result.

I quickly checked a couple of other PDF files and they were OK, tried on Windows
and invoice-reduced displays OK.

Comment 2 Till Kamppeter 2009-07-29 06:21:32 UTC

For me at least "png16m" gives the correct result (on Ubuntu Karmic, GS 8.70RC1
Debian-packaged without patches applied to the code of GS).

Comment 3 Ken Sharp 2009-07-29 06:26:13 UTC

It appears that the image in the PDF file is a soft mask, inside a Pattern :-(
The page content stream sets the Pattern colour space and then fills a rectangle
(full page, 612x792) with it.

Possibly one for Michael to look at ?

Comment 4 Ray Johnston 2009-07-29 09:36:39 UTC

Please specify the device you are using -- 'screen' is ambiguous.

On many linux/unix systems the default device is x11alpha and there are known
problems with x11alpha and pages with transparency (bugs currently open).

If the default device is x11alpha, please try with -sDEVICE=x11

Comment 5 Till Kamppeter 2009-07-29 09:58:22 UTC

You are right. With "x11alpha" the mentioned problem occurs, with "x11" the file
displays correctly.

Comment 6 Till Kamppeter 2009-07-29 10:21:47 UTC

Can you put references to the x11alpha transperency bugs here?

Comment 7 Ray Johnston 2009-07-30 10:11:47 UTC

This needs fixing to make GraphicsAlphaBits=4 compatible with transparency.

Comment 8 Michael Vrhel 2011-04-09 05:14:02 UTC

This renders correctly as of rev 12380