how to save pixmap as GIF

[timmu]

I know how to save a QPixmap (map) as a bitmap:

map.save("image.bmp", 0, -1);

map.save("image.bmp", 0, -1);

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The above won't work for the *.gif image format because I need plugins for the image formats other than bitmap. I got this to work when I was linking statically with another program but now I'm linking dynamically. I think I need to modify my *.pro file and main.cpp somehow. I'm not sure how to do that. This is what I have so far:

My *.pro file:

TEMPLATE = app
TARGET = 
DEPENDPATH += .
INCLUDEPATH += .
CONFIG += plugin
QTPLUGIN += qjpeg \
                     qgif \
                     qtiff
# Input
HEADERS += binary.h
 
SOURCES += functions.cpp \
                    main.cpp

TEMPLATE = app
TARGET = 
DEPENDPATH += .
INCLUDEPATH += .
CONFIG += plugin
QTPLUGIN += qjpeg \
                     qgif \
                     qtiff
# Input
HEADERS += binary.h

SOURCES += functions.cpp \
                    main.cpp

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I wonder if I need these at the beginning of my main.cpp or is this something you only use for static linking?:

Q_IMPORT_PLUGIN(qjpeg)
Q_IMPORT_PLUGIN(qgif)
Q_IMPORT_PLUGIN(qtiff)

Q_IMPORT_PLUGIN(qjpeg)
Q_IMPORT_PLUGIN(qgif)
Q_IMPORT_PLUGIN(qtiff)

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Thanks so much!

[spirit]

you can load gifs using QMovie, but I don't see any method which allows to save into gif-format file.

[timmu]

I'm a little bit confused. I'm pretty sure I've seen people turn pixmaps into gif files with Qt but I just cannot figure out how or find the instructions.

[spirit]

as Qt Assistant says, Qt can only read gifs

Format Description Qt's support
GIF Graphic Interchange Format (optional) Read

take a look docs about QPixmap.

[timmu]

Thanks, but what about writing JPEGs. I need to write very large image files and the reason BMP won't work is because the file size is huge. I could also use JPEG. Do you know if writing JPEG is possible and what plugins are needed?

[spirit]

BMP Windows Bitmap Read/write
GIF Graphic Interchange Format (optional) Read
JPG Joint Photographic Experts Group Read/write
JPEG Joint Photographic Experts Group Read/write
PNG Portable Network Graphics Read/write
PBM Portable Bitmap Read
PGM Portable Graymap Read
PPM Portable Pixmap Read/write
XBM X11 Bitmap Read/write
XPM X11 Pixmap Read/write

this means that you can write JPG.