On Oct 18, 2010, at 04:37, Amy Heavey wrote:
> The source images are not generated by us, they are from a variety of surces,
> and are generally 200pixels + on each side, however sometimes they are 72
> dpi, and sometimes they are 300dpi. Even if an aimage is 450pixels square,
> when it is set as 300 dpi it's reduced too small when my app reduces it it to
> fit a 75pixel square area.
>
> I know this is to do with the bitmapRepresentation, but I can't work out how
> to change it. If I was doing this in photoshop I'd be keeping the actual
> pixel count, but changing the resolution from 300 to 72 for these images.
>
> Can anyone point me in the right direction? Here's the code I'm using at the
> moment:
>
> while ((imgPath = [imageLoop nextObject])) {
> NSImage *img = [[NSImage alloc]initWithContentsOfFile:imgPath];
> [targetImage lockFocus];
>
> [img drawInRect:NSMakeRect(x,y,75,75)
> fromRect:NSMakeRect(20,20,0,0) operation:NSCompositeCopy fraction:1];
What does "too small" mean? Are you saying that your original image is being
drawn somewhere inside your 75-pixel square, failing to fill it completely?
Also, I don't understand the intended significance of your
'fromRect:NSMakeRect(20,20,0,0)' parameter. This should either be the part of
the original image you want to transfer to the destination, or NSZeroRect to
copy the whole thing.
If you're copying the whole image, I can't see that the "resolution" (in the
sense of "dpi") has any significance to 'drawInRect:...'. It really only comes
into play when relating the absolute (in points) size of two different images
or contexts. You can always adjust the (effective) resolution of a NSImage by
calling 'setSize:' with the absolute size you want. This does not change the
pixel size of the underlying representation.
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