objective c - NSImage Image Size With Multiple Layers -


i have mac (not ios) application allows user select 1 or more images nsopenpanel. have trouble how correct dimensions multiple-layered images. if image contains 1 layer or compressed, following me correct image dimensions file path.

nsimage *image0 = [[nsimage alloc] initwithcontentsoffile:path]; cgfloat w = image0.size.width; cgfloat h = image0.size.height;

but if select image has multiple layers, i'll strange numbers. example, have single-layer image dimensions 1,440 x 900 px according fireworks. if add small layer of circle , save image png , read it, 1,458 x 911 px. according this topic , this topic, suggest read largest layer. okay. i've created function follows.

- (cgsize)getimagesize :(nsstring *)filepath {     nsarray * imagereps = [nsbitmapimagerep imagerepswithcontentsoffile:filepath];     nsinteger width = 0;     nsinteger height = 0;     (nsimagerep * imagerep in imagereps) {         if ([imagerep pixelswide] > width) width = [imagerep pixelswide];         if ([imagerep pixelshigh] > height) height = [imagerep pixelshigh];     }     nssize size = cgsizemake((cgfloat)width, (cgfloat)height);     return size; }

using function above, wrong dimensions (1,458 x 911 px) instead of 1,440 x 900 px. actually, had same problem when developing mac applications real stupid till few years ago. how can correct dimensions when image contains multiple layers?

thank advice.


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