problem about creating thumbnail

Question

User870757769 posted
Hi everybody! I had a problem while creating thumbnail from an image . the thumbnail's file size is bigger than the original image , please tell me what wrong with it? thanks a lot

Answer 1

User-680512290 posted
It's hard to know without some detail. What format is the input image and what dimensions, number of colours etc? What format, size, dimensions is the output image? You can find that if you recompress, say a JPEG image, twice, the final image is bigger than the original. Cheers

Answer 2

User870757769 posted
I test on the .jpg and .gif format . and I call the getthumbnailImage as follow: myBitmap.GetThumbnailImage(intThumbnailWidth,intThumbnailHeight,myCallback,IntPtr.Zero); ofcourse the thumbnail's width and height is smaller than the origial one After the thumbnail was created , I clicked to view it property (in windows explorer). I found that the thumbnail's bit depth is 32 while my original image is only 24 . I think that why the thumail's filesize is bigger than the original . But I don't know how to set the bit depth property

Answer 3

User-597377768 posted

img.Save(path,PixelFormat.xxxxx);

Change your PixelFormat to 24bit which is RGB, not ARGB

Answer 4

User870757769 posted

thanks [:)]