Programming Forums > Script Programming > Python

Sane · Dec 12th, 2005, 8:39 AM

Yeah, I was bored, so I made a pic --> grayscale program in Pygame.

fileName  = "python.gif"
red       = False
green     = True
blue      = False
########################

from pygame.image import load, save

pic = load(fileName)

for x in range(pic.get_width()):
    for y in range(pic.get_height()):

        c = list(pic.get_at((x,y))[:3])
        deg = (c[0]*red + c[1]*green + c[2]*blue) / (red + green + blue)
        
        pic.fill( [deg]*3, ((x,y),(1,1)) )

save(pic, "%s_%s%s%s.bmp"%(fileName.split('.')[0],
                           'R'*red,
                           'G'*green,
                           'B'*blue))

The user can select if it measures the degree based on R, G or B. Or any combination of the latter. A good example of manipulating boolean values I guess.

Here's an example: http://netpub.cstudies.ubc.ca/oleary/images/python.gif

Outputs: http://img204.imageshack.us/img204/8374/pythong4qm.png

I think it actually works quite beautifully.

Bleeeeh. ^_^

Cerulean · Dec 12th, 2005, 4:10 PM

Heh, cool. You might wanna try and write the PIL equivalent - should be easy peasy using the Image.point function.

Sane · Dec 12th, 2005, 7:38 PM

Python Image Library?

But that would mean I'd have to learn new functions... hmmm... >_>

I'm thinking of maybe doing more image conversions/manipulations. Any ideas?

And by the way, in my program, if you replace the True/False with a number. It'll take that number and use it as a percentage/weight. Pretty cool.

Arevos · Dec 13th, 2005, 2:00 AM

Maybe:

(Toggle Plain Text)

from PIL import Image, ImageEnhance
image = Image.open(filename)
greyscale_image = ImageEnhance.Color(image).enhance(0.0)

I think that should work, though I haven't yet tried it.

Dietrich · Dec 14th, 2005, 1:10 AM

Going from a color .jpg to grayscale:

(Toggle Plain Text)

# PIL convert to grayscale mode "L"

import Image

im1 = Image.open("Arevos.jpg")
im2 = im1.convert("L")

im2.show()
im2.save("ArevosGray.jpg")

Cerulean · Dec 14th, 2005, 11:21 AM

Quote:

But that would mean I'd have to learn new functions... hmmm... >_>

If you're gonna do a lot of image stuff it makes sense to use PIL - I assume it'll be faster for images, reads and writes more formats, and has more convenience functions (for adjusting contrast and the like). Laziness is good, and you'll be able to be lazier if you use PIL. Just take the time up front to learn to use the methods it provides.

MBirchmeier · Dec 14th, 2005, 11:59 AM

<troll>
Now make one that goes from black and white to color

</troll>

I think i'd tweak the red/green/blue values to be integers or even doubles, to provide a different weighting of colors. IIRC a blue generally shows up 'darker' than a simiairly bright green.

Overall though good job, and interresting use of boolean 'division'

-MBirchmeier

Sane · Dec 14th, 2005, 12:03 PM

"I think i'd tweak the red/green/blue values to be integers or even doubles, to provide a different weighting of colors. IIRC a blue generally shows up 'darker' than a simiairly bright green."

Quote:

Originally Posted by Sane

And by the way, in my program, if you replace the True/False with a number. It'll take that number and use it as a percentage/weight. Pretty cool.

>_>

MBirchmeier · Dec 14th, 2005, 12:38 PM

**Disclaimer : Anything stupid I say in this post and previous and/or future posts are subject to mockery, however any information in said posts are not to be used for any legal or for trade applications. Additionally any failure to fully read or comprehend the posts of others shall in no way detract from or preclude my ability to sound like a 'know-it-all' or expert.

Dec 12th, 2005, 8:39 AM	#1
Sane Programming Guru Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 1,888 Rep Power: 5	Grayscale Converter with Pygame Yeah, I was bored, so I made a pic --> grayscale program in Pygame. (Toggle Plain Text) fileName = "python.gif" red = False green = True blue = False ######################## from pygame.image import load, save pic = load(fileName) for x in range(pic.get_width()): for y in range(pic.get_height()): c = list(pic.get_at((x,y))[:3]) deg = (c[0]red + c[1]green + c[2]blue) / (red + green + blue) pic.fill( [deg]3, ((x,y),(1,1)) ) save(pic, "%s_%s%s%s.bmp"%(fileName.split('.')[0], 'R'red, 'G'green, 'B'blue)) fileName = "python.gif" red = False green = True blue = False ######################## from pygame.image import load, save pic = load(fileName) for x in range(pic.get_width()): for y in range(pic.get_height()): c = list(pic.get_at((x,y))[:3]) deg = (c[0]red + c[1]green + c[2]blue) / (red + green + blue) pic.fill( [deg]3, ((x,y),(1,1)) ) save(pic, "%s_%s%s%s.bmp"%(fileName.split('.')[0], 'R'red, 'G'green, 'B'blue)) The user can select if it measures the degree based on R, G or B. Or any combination of the latter. A good example of manipulating boolean values I guess. Here's an example: http://netpub.cstudies.ubc.ca/oleary/images/python.gif Outputs: http://img204.imageshack.us/img204/8374/pythong4qm.png I think it actually works quite beautifully. Bleeeeh. ^_^

Dec 13th, 2005, 2:00 AM	#4
Arevos Programming Guru Join Date: Aug 2005 Location: England Posts: 1,499 Rep Power: 5	Maybe: (Toggle Plain Text) from PIL import Image, ImageEnhance image = Image.open(filename) greyscale_image = ImageEnhance.Color(image).enhance(0.0) from PIL import Image, ImageEnhance image = Image.open(filename) greyscale_image = ImageEnhance.Color(image).enhance(0.0) I think that should work, though I haven't yet tried it.

Dec 14th, 2005, 1:10 AM	#5
Dietrich Professional Programmer Join Date: Feb 2005 Posts: 434 Rep Power: 4	Going from a color .jpg to grayscale: (Toggle Plain Text) # PIL convert to grayscale mode "L" import Image im1 = Image.open("Arevos.jpg") im2 = im1.convert("L") im2.show() im2.save("ArevosGray.jpg") # PIL convert to grayscale mode "L" import Image im1 = Image.open("Arevos.jpg") im2 = im1.convert("L") im2.show() im2.save("ArevosGray.jpg") __________________ I looked it up on the Intergnats!

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Dec 12th, 2005, 4:10 PM	#2
Cerulean Professional Programmer Join Date: Apr 2005 Location: London, England Posts: 459 Rep Power: 4	Heh, cool. You might wanna try and write the PIL equivalent - should be easy peasy using the Image.point function.

Dec 12th, 2005, 7:38 PM	#3
Sane Programming Guru Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 1,888 Rep Power: 5	Python Image Library? But that would mean I'd have to learn new functions... hmmm... >_> I'm thinking of maybe doing more image conversions/manipulations. Any ideas? And by the way, in my program, if you replace the True/False with a number. It'll take that number and use it as a percentage/weight. Pretty cool.

Dec 14th, 2005, 11:59 AM	#7
MBirchmeier Hobbyist Programmer Join Date: Oct 2005 Posts: 211 Rep Power: 3	<troll> Now make one that goes from black and white to color </troll> I think i'd tweak the red/green/blue values to be integers or even doubles, to provide a different weighting of colors. IIRC a blue generally shows up 'darker' than a simiairly bright green. Overall though good job, and interresting use of boolean 'division' -MBirchmeier

Dec 14th, 2005, 12:38 PM	#9
MBirchmeier Hobbyist Programmer Join Date: Oct 2005 Posts: 211 Rep Power: 3	**Disclaimer : Anything stupid I say in this post and previous and/or future posts are subject to mockery, however any information in said posts are not to be used for any legal or for trade applications. Additionally any failure to fully read or comprehend the posts of others shall in no way detract from or preclude my ability to sound like a 'know-it-all' or expert.

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Programming Forums > Script Programming > Python

Grayscale Converter with Pygame