Le 29/11/12 11:41, Vincent Vande Vyvre a écrit :
> I'm trying to see what option is supported by QImageWriter().
>
> A test code:
> -----------------------------------------------------------------------------------------------------
> # -*- coding: utf-8 -*-
>
> from PyQt4.QtGui import QImageWriter, QImageIOHandler
>
> frmts = ['bmp', 'bw', 'eps', 'ico', 'jp2', 'jpg', 'pcx',
> 'pgm', 'png', 'ppm', 'rgb', 'rgba', 'sgi', 'tga',
> 'tiff', 'xbm', 'xpm', 'xv']
>
> opts = [QImageIOHandler.CompressionRatio, QImageIOHandler.Gamma,
> QImageIOHandler.Quality]
>
> iw = QImageWriter()
> for fr in frmts:
> print fr, "\t",
> iw.setFormat(fr)
> for opt in opts:
> print iw.supportsOption(opt),
> print
>
> ------------------------------------------------------------------------------------------------------
>
> But, for all formats the options are False:
>
> ...
> jpg False False False
> pcx False False False
> pgm False False False
> png False False False
> ppm False False False
> tga False False False
> tiff False False False
> ...
>
> Python 2.7 > PyQt4 4.9.1
> Python 3.3 > PyQt4 4.9.5
>
> Thanks for all advices.
>
>
Found it, the QImageWriter needs a file name before request for the
support of option.
This works:
------------------------------------------------------------
for fr in frmts:
print fr, "\t",
iw.setFileName("imgfile." + fr)
iw.setFormat(fr)
for opt in opts:
print iw.supportsOption(opt),
print
------------------------------------------------------------
--
Vincent V.V.
Oqapy <https://launchpad.net/oqapy> . Qarte
<https://launchpad.net/qarte> . PaQager <https://launchpad.net/paqager>
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