Re: Image orientation and color information with PIL?
Jeff, this was exactly what I was looking for. I wrote a script with this code and it worked perfectly. Thanks Ty -- http://mail.python.org/mailman/listinfo/python-list
Re: Image orientation and color information with PIL?
Hi All-- [EMAIL PROTECTED] wrote: Does anyone know if it is possible to determine if an image is horizontal/vertical and color or black white using the python image library? I have been searching this news group and the information was not all clear on this. How are you going to determine the orientation of an image without sophisticated image analysis? I suspect Adobe Photoshop can do it, but I don't know for sure. You'd have to look for things like sky, or clouds, overcast sky, people's faces, and so on and so forth. It'd be cool to have this available in Python, but unless the F-bot is busier than I thought and working behind the scenes using his time machine, it's not there now. If you write it I'll use it;-) Color vs BW ought to be easy, though, by analysing the color table, if there is one, and/or image mode. Check the PIL documentation. If you have only searched the newsgroup then you might have overlooked the docs. Metta, Ivan -- Ivan Van Laningham God N Locomotive Works http://www.andi-holmes.com/ http://www.foretec.com/python/workshops/1998-11/proceedings.html Army Signal Corps: Cu Chi, Class of '70 Author: Teach Yourself Python in 24 Hours -- http://mail.python.org/mailman/listinfo/python-list
Re: Image orientation and color information with PIL?
i = Image.open(blue.jpg) i.size (3008, 2000) i.mode 'RGB' 'RGB' is the value for color jpeg images. I believe that for blackwhite images, i.mode is 'L' (luminosity). If you want to determine whether an existing image is landscape or portrait, then just compare i.size[0] (width) and i.size[1] (height). If by determine if an image is horizontal/vertical, you want to find the orientation data recorded by some digital cameras, you can do that with PIL 1.1.4. According to the release notes for 1.1.4, + Added experimental EXIF support for JPEG files. To extract EXIF information from a JPEG file, open the file as usual, and call the _getexif method. If successful, this method returns a dictionary mapping EXIF TIFF tags to values. If the file does not contain EXIF data, the _getexif method returns None. The ExifTags module contains a dictionary mapping tags to tag names. This interface will most likely change in future versions. The exif tag 274 is Orientation. The values you'll see most often are 1 (Normal), 6 and 8 (90 and 270 degree rotations). Orientation can also encode 180 degree rotation, as well as any of the four rotations combined with a mirror operation. [k for (k,v) in ExifTags.TAGS.items() if v == 'Orientation'] [274] e = i._getexif() if e: print e[274] 1 I have written a standalone Python module that reads and changes the EXIF orientation data. You can view it here: http://unpy.net/cgi-bin/viewcvs.cgi/aethertool/disorient.py?rev=1.2content-type=text/vnd.viewcvs-markup It is available under the terms of the GNU GPL. Here's another page about EXIF orientation data: http://sylvana.net/jpegcrop/exif_orientation.html Jeff pgpbJ5BO1Z3ui.pgp Description: PGP signature -- http://mail.python.org/mailman/listinfo/python-list
Re: Image orientation and color information with PIL?
if you mean that you want to figure out which way the image is depending on the actual data in the image, then you'll most likely get to do the image processing yourself, on the other hand, if you are talking jpegs from a relatively new camera then I suppose that you should be able to get that info by looking at the EXIF information. AFAIK you can read exif with PIL, but not write. -- http://mail.python.org/mailman/listinfo/python-list
Re: Image orientation and color information with PIL?
On Mon, Jul 18, 2005 at 10:55:42AM -0600, Ivan Van Laningham wrote: How are you going to determine the orientation of an image without sophisticated image analysis? There is research on automatic image orientation detection. [...] If you write it I'll use it;-) There's research going on in this area. Here are a few papers: http://www.dcs.shef.ac.uk/teaching/eproj/msc2004/abs/m3zs2.htm http://research.microsoft.com/research/pubs/view.aspx?pubid=918 there are probably many others. I considered implementing one of these algorithms back in 2003 or so, but instead I bought a digital camera with an orientation sensor. Jeff pgpJZsejWH68l.pgp Description: PGP signature -- http://mail.python.org/mailman/listinfo/python-list
