[Image-SIG] PIL 1.1.5 - Loss of resolution

[kevin@cazabon.com]

When you rotate an image, you're not modifying the image in place - the result is a new image, which unfortunately doesn't carry the format data from the original.

You can simply copy the data over yourself from the original, or supply the dpi setting to the TIFF module when saving (it's supported now).

Kevin.
  ----- Original Message ----- 
  From: Tim Ake 
  To: image-sig at python.org 
  Sent: Monday, June 27, 2005 11:31 PM
  Subject: [Image-SIG] PIL 1.1.5 - Loss of resolution


  Hi,
  I am using PIL 1.1.5 with Python 2.4, and am seeing a loss of resolution when dealing with images. I open an image that is 200 dpi, do a rotate, and save the rotated image. What I'm seeing is that the rotated image is saved at the same size, but is at 100 dpi instead of 200 dpi. My code frament is as follows:

      # open the tif file image
      im = Image.open(strFile)
      # rotate the image 90 degrees CCW
      om = im.rotate(90)
      # save the image as a.tif
      om.save("a.tif", "TIFF")    #save the rotated file

  I can't afford a loss of resolution - any thoughts on maintaining my original resolution?

  Thanks!

  Tim Ake 
  335 Old Hickory Rd. 
  Woodstock, GA 30188 
  mailto:tim at timake.com 
  http://www.timake.com 
  (770) 928-2433 (phone) 
  (404) 944-4890 (cell) 
   soli deo gloria 

    



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