pixel

Im having trouble displaying pixel based art (think retro tiles and art) on OpenGL Es 1.1 on the iPhones. Tiles are represented using 8bytes (1 byte for each row) with each bit representing a pixel being set or not. For example a tile with the number 8: 0 0 0 0 0 0 0 0 -> 0 0 1 1 1 0 0 0 -> xxx 0 1 0 0 0 1 0 0 -> x x 0 1 0 0 0 1 0 0 -> x x 0 0 1 1 1 0 0 0 -> xxx 0 1 0 0 0 1 0 0 -> x x 0 1 0 0 0 1 0 0 -> x x 0 0 1 1 1 0 0 0 -> xxx Converting this to OpenGL on iPhone using glDrawArrays(GL_POINTS, 0, 64); The logic is correct, but the problem is it doesn't give the retro effect. I was looking for

How can I convert a string containing a jpeg or png to an array (preferably one dimensional) of pixels? Ideally using classes built into java? It turns out you need commons-fileupload . Look at the user guide for how to obtain the image InputStream . From there you can simply call: BufferedImage image = ImageIO.read(item.getInputStream()); From here on there are many ways: loop over the image dimensions and for each x and y call int rgb = image.getRGB(x, y); same as above, but call getRed(x, y) , getGreen(x, y) , getBlue(x, y) get the ColorModel and call the above methods there call getRGB

I am trying to do a pixel by pixel comparison of two UIImages and I need to retrieve the pixels that are different. Using this Generate hash from UIImage I found a way to generate a hash for a UIImage. Is there a way to compare the two hashes and retrieve the different pixels? Rob If you want to actually retrieve the difference, the hash cannot help you. You can use the hash to detect the likely presence of differences, but to get the actual differences, you have to use other techniques. For example, to create a UIImage that consists of the difference between two images, see this accepted

I'm using Intent to call and show an image from Gallery, and now I made it enable to get me the coordinates of the image in a TextView using these: final TextView textView = (TextView)findViewById(R.id.textView); final TextView textViewCol = (TextView)findViewById(R.id.textViewColor); targetImage.setOnTouchListener(new ImageView.OnTouchListener(){ @Override public boolean onTouch(View v, MotionEvent event) { // TODO Auto-generated method stub int x=0; int y=0; textView.setText("Touch coordinates : " + String.valueOf(event.getX()) + "x" + String.valueOf(event.getY())); ImageView imageView = (

I'm a beginner in python and i would like the way to change all of the pixels of a photo to white, except the pixels that white or black that were already in the photo. I tried to use PIL but I couldn't find it. Thanks! i would like the way to change all of the pixels of a photo to white, except the pixels that white or black that were already in the photo. So basically you want to change all pixels to white except black, right? If so, then below work (note: it expect cv2 lib is installed on your machine) import cv2 import numpy as np img = cv2.imread('my_img.jpeg') img[img != 0] = 255 #