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Doubling the size of an image

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Doubling the size of an image

 
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  #1
Oct 10th, 2005
I'm working on some python programming and I need some help as to how to double the size of a picture using the image module.... any ideas?!
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Re: Doubling the size of an image

 
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  #2
Oct 11th, 2005
Is the picture you are loading smaller than what you want to display? If yes, the quality will suffer quite a bit! The program has to make up missing information.

Are you using the Python Image Library PIL for this?
May 'the Google' be with you!
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Re: Doubling the size of an image

 
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  #3
Oct 11th, 2005
I know the quality will be degraded, but I'm going for making it larger either way.... and yes I'm using the PIL.... and yes I am going from smaller to larger.....
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Re: Doubling the size of an image

 
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  #4
Oct 11th, 2005
I worked on this for a while and put the code into the Python snippet section:
http://www.daniweb.com/code/snippet396.html

Hope you find it constructive for your needs.
May 'the Google' be with you!
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Re: Doubling the size of an image

 
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  #5
Oct 12th, 2005
Here is what I have done... some steps i did may not have been necessary, for example the extra color variables.... though now i need help with my zoom factor.... because this works for zooming in two times... but when higher numbers come about it skips pixels... i messed around with an extra for loop but its still the same... any other ideals?
Python Syntax (Toggle Plain Text) 
  1. def enlarge(oImage,w,h,x,y,zoom):
  2.     nImage= EmptyImage(w*zoom,h*zoom)
  3.     for q in range(w):
  4.         x = x +zoom
  5.         y = 0
  6.         for z in range(h):
  7.             color = oImage.getPixel(q,z)
  8.             red= color[0]
  9.             green= color[1]
  10.             blue= color[2]
  11.             nImage.setPixel(x ,y ,(red,green,blue))
  12.             nImage.setPixel(x+1,y +1,(red,green,blue))
  13.             nImage.setPixel(x+1, y,(red,green,blue))
  14.             nImage.setPixel(x, y+1,(red,green,blue))
  15.             for lea in range(1,zoom):
  16.                 nImage.setPixel(x+lea,y+lea,(red,green,blue))
  17.                 nImage.setPixel(x, y+lea,(red,green,blue))
  18.                 nImage.setPixel(x+lea,y, (red, green,blue))
  19.             y = y +zoom
  20.     r = nImage
  21.     winner = ImageWin("Big Picture", w*zoom, h*zoom)
  22.     r.draw(winner)
  23.     winner.getMouse()
  24.     winner.close()
  25.  
  26.  
  27. def main():
  28.     picname= raw_input("Enter Picture name with .jpg, .bmp, or ending: ")
  29.     oImage= FileImage(picname)
  30.     h= oImage.getHeight()
  31.     w= oImage.getWidth()
  32.     win = ImageWin("Original", w,h)
  33.     oImage.draw(win)
  34.     y = 0
  35.     zoom = input("Number of times to zoom: ")
  36.     x = -(zoom)
  37.  
  38.     enlarge(oImage,w,h,x,y,zoom)
  39.  
  40.     win.getMouse()
  41.     win.close()
  42.  
  43.  
  44. main()
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Re: Doubling the size of an image

 
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  #6
Oct 13th, 2005
Nice project c_shaft05 you do much thinking here!
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Re: Doubling the size of an image

 
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  #7
Oct 13th, 2005
I need to refraise what i said... I need help being able to take a user input for the number of times to zoom in and put it into my program but I need help with the for loop in how to do it.... pixels are being skipped when i go in to higher numbers!
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Re: Doubling the size of an image

 
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  #8
Oct 16th, 2005
I remember in school they talked about DIB (device indepentant bitmaps) to be best for stretching/enlarging. Was C class for graph artists.
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Re: Doubling the size of an image

 
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  #9
Oct 19th, 2005
Meh.... yea... I don't know what you are talking about ... but yea... I just need help looping it to the point where its not skipping Pixels......
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Re: Doubling the size of an image

 
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  #10
Oct 19th, 2005
There is something missing in your code. What do you import?
May 'the Google' be with you!
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