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POIncorrect colors when reconstructing an image from arrays with pygame/pyglet
 

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  1. POIncorrect colors when reconstructing an image from arrays with pygame/pyglet
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    <p>I wrote up this program that would use numpy and Image(PIL) library to read an image as a bunch of matrices and use pyglet(and opengl) to reconstruct the image.</p> <p>The code using pyglet is as follows:</p> <pre><code>import Image import numpy import window import sys import pyglet import random a=numpy.asarray(Image.open(sys.argv[1])) h,w= a.shape[0],a.shape[1] s=a[0] print s.shape ####################################### def display(): x_a=0;y_a=h for page in a: for array in page: j=array[2] k=array[1] l=array[0] pyglet.gl.glColor3f(l,j,k) pyglet.gl.glVertex2i(x_a,y_a) x_a+=1 y_a-=1 x_a=0 ######################################33 def on_draw(self): global w,h self.clear pyglet.gl.glClear(pyglet.gl.GL_COLOR_BUFFER_BIT) pyglet.gl.glBegin(pyglet.gl.GL_POINTS) display() pyglet.gl.glEnd() pyglet.image.get_buffer_manager().get_color_buffer().save('screenshot.png') window.win.on_draw=on_draw ####################################### u=window.win(w,h) pyglet.app.run() </code></pre> <p>The same code modified to use the pygame library (and which is devoid of any opengl usage)</p> <pre><code>import pygame import numpy import Image import sys from pygame import gfxdraw color=(255,255,255) a=numpy.asarray(Image.open(sys.argv[1])) h,w=a.shape[0],a.shape[1] pygame.init() screen = pygame.display.set_mode((w,h)) def uu(): y_a=0 for page in a: x_a=0 for array in page: co=(array[0],array[1],array[2]) pygame.gfxdraw.pixel(screen,x_a,y_a,co) x_a+=1 y_a+=1 uu() done = False while not done: for event in pygame.event.get(): if event.type == pygame.QUIT: done = True pygame.display.flip() </code></pre> <p>The result from pyglet vs. pygame:</p> <p><img src="https://i.stack.imgur.com/kQb5c.png" alt="pyglet vs pygame"></p> <p>So my question is...why is there a problem? Is there a problem with the way I utilised opengl to draw the picture pixel by pixel or there something else that is for now beyond my comprehension?</p>
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    1. COYou don't explain what isn't working. Are you expecting it to use the image as a normal texture in pyglet?
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    2. COwell,a very battered form of the image appears instead of a perfect one..I would have posted the original pic and the output from the above code..but since I am a newbie with no ranking or reputation ,I can't do so.
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    3. COYou can post images on imgur, and link it. Are you using pygame and PIL and pyglet? I didn't see an import but you're tagged as pygame so I was confused. -- I did searching for you but I can't find the specific post. There's a way to load pygame surfaces as opengl (pyglet) textures.
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