It really is a PNG and it's 16-bit grayscale. $ file gcp.png gcp.png: PNG image data, 1024 x 768, 16-bit grayscale, non-interlaced
I can reproduce, the blank white show() output, which clearly is a bug in PIL. PIL opens it in "I" mode print im.mode which means "integer", but I don't know whether this is correct or not. Maybe "I;16" or so could be tried. See http://svn.effbot.org/public/tags/pil-1.1.4/libImaging/Unpack.c for possible modes. QuickFix: Make a JPG. $ convert gcp.png gcp.jpg ... im = Image.open('gcp.jpg') ... Have a nice day, Matthias Am Samstag, den 04.02.2012, 10:58 -0500 schrieb Chris Mitchell: > Hey Nelson, > > Are you sure this image isn't actually a tiff (Every gel scanner I've ever > used outputs tiffs)? Also, is it opening as an 8 bit image or a 16 bit? > For a gel scan, it should be a 16 bit image, so you can consider forcing > the mode while opening it.. > > Chris > > On Tue, Jan 31, 2012 at 1:38 PM, Nelson Tong <tongsnelson....@gmail.com>wrote: > > > thanks for reply, Matthias, > > > > when I use "show()", the image appears to have an all-white > > background, nothing else is on it. The size does indeed match the png > > size , I used the following to confirm: > > > > x, y = outIm.size > > print "size of outImg: " + str(x)+" " + str(y); > > > > I tries to resave the png as a png image with a different name using > > PIL and show() of the 2nd png image still appear to have all-white > > background with nothing on it. > > > > but If I open the images (both the 1st and the re-saved image ) with > > the command line command of "display", I can see the images via > > ImageMagick. > > > > Attached is example image which I am having problem with. Can you > > reproduce the same problem I'm seeing with this image, possibly due to > > the png image being broken? > > > > -N. > > > > > > On 1/29/12, Matthias Bock <matthiasb...@users.sourceforge.net> wrote: > > > Am Freitag, den 27.01.2012, 11:11 -0500 schrieb Nelson Tong: > > > > > >> outI = Image.open( fileOutPNGFile ) > > >> outI.show(); > > >> > > >> The code run without error, but the image return via X-windows on my > > >> linux machine is a blank image, without visible graphic on it. > > > > > > What color is this "blank": Grey? White? > > > Does the size match the PNG size? > > > > > >> I am 100% positive that the image of fileOutPNGFile is not corrupted > > >> because I am able to open it via the web-browser. > > > > > > Web browsers can open corrupted image files. > > > > > >> I tried the same code another to open another png file which I use > > >> PIL to draw and save as png. The code above is able to open and show > > >> this png file properly. > > > > > > Sounds to me, as if the first PNG was broken. > > > > > > Try this: > > > > > > outI = Image.open( fileOutPNGFile ) > > > outI.show() > > > outI.save('test.png') > > > out2 = Image.open('test.png') > > > out2.show() > > > > > >> why might this happen? > > > > > > If the code doesn't help solving the issue, > > > could you send the PNG to the list? > > > > > > Cheers, Matthias > > > > > > _______________________________________________ Image-SIG maillist - Image-SIG@python.org http://mail.python.org/mailman/listinfo/image-sig