On 09.01.2009, at 15:11, Parimal Das wrote:
in my application i need to resize a .jpg image through a command line
What does it mean: "resize" ?. Every NSBitmapImageRep has two sizes:
a (print-)size which says how long width and hight (expressed in
inch, cm or printerpoints or ...)
of the depicted (printed) image are. This value can be set (changed)
with -setSize:.
And it has a (storage-)size which says how many pixel the image has
expressed as a dimensionless number.
The connection between these two "sizes" is the "resolution".
Changing the pixelnumbers results
in a rendering process.
Next point: An icon (NSImage) is a container of several
NSBitmapImageReps. You have to select
the one that fits best.
That lets me make a proposal which is close to your first try:
NSImage *icon = [[NSWorkspace sharedWorkspace]
iconForFile:filePath];
NSSize imageSize = { 384.0, 384.0 }; // in points (384 pts = 512
px at 96 dpi resolution)
[icon setSize:imageSize];
NSBitmapImageRep *bitmapImageRep = (NSBitmapImageRep *)[icon
bestRepresentationForDevice:nil];
[bitmapImageRep setSize:imageSize]; // <--- do not forget !!!
[[bitmapImageRep representationUsingType:NSJPEGFileType
properties:nil]
writeToFile:destPath
atomically:YES];
--
Heinrich Giesen
gies...@acm.org
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