Image Sizes in Bridge - Help!!!!
I wondered if anybody could help me.
I have a few hundred photos that I have in both colour and black & white. I have batch renamed them all into a different folder.
All of the colour images are showing as normal size when I click on them individually. However, some of the black & white versions of the same photos are coming up smaller when I click on them. This doesn't happen to all of the images though. The ones that are coming up smaller seem to have a thin black border around the thumbnail.
Does anybody know what this might be and how to get the images back to full size?
All the photos have been saved as high resolution JPEGs so there are no differences here.
Any ideas or help is appreciated. Thanks.
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Need help to find image size box
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Help with displaying image using OpenGL ES sample code - image size prb
I am using some sample code that currently displays an image 256x256 pixels. The code states the image size must be a power of 2. I have tried an image 289x289 (17^2) and it displays a square the same size as the 256x256 with a white background. I want an image 320x320 displayed. Should be obvious for people familiar with OpenGL. Here is the code which displays the image and rotates:
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// Sets up an array of values to use as the sprite vertices.
const GLfloat spriteVertices[] = {
-0.5f, -0.5f,
0.5f, -0.5f,
-0.5f, 0.5f,
0.5f, 0.5f,
// Sets up an array of values for the texture coordinates.
const GLshort spriteTexcoords[] = {
0, 0,
1, 0,
0, 1,
1, 1,
CGImageRef spriteImage;
CGContextRef spriteContext;
GLubyte *spriteData;
size_t width, height;
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glViewport(0, 0, backingWidth, backingHeight);
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glLoadIdentity();
glOrthof(-1.0f, 1.0f, -1.5f, 1.5f, -1.0f, 1.0f);
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//glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glClearColor(255, 255, 255, 1.0f);
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glVertexPointer(2, GL_FLOAT, 0, spriteVertices);
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glTexCoordPointer(2, GL_SHORT, 0, spriteTexcoords);
glEnableClientState(GLTEXTURE_COORDARRAY);
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spriteImage = [UIImage imageNamed:@"bottle.png"].CGImage;
// Get the width and height of the image
width = CGImageGetWidth(spriteImage);
height = CGImageGetHeight(spriteImage);
// Texture dimensions must be a power of 2. If you write an application that allows users to supply an image,
// you'll want to add code that checks the dimensions and takes appropriate action if they are not a power of 2.
if(spriteImage) {
// Allocated memory needed for the bitmap context
spriteData = (GLubyte *) malloc(width * height * 4);
// Uses the bitmatp creation function provided by the Core Graphics framework.
spriteContext = CGBitmapContextCreate(spriteData, width, height, 8, width * 4, CGImageGetColorSpace(spriteImage), kCGImageAlphaPremultipliedLast);
// After you create the context, you can draw the sprite image to the context.
CGContextDrawImage(spriteContext, CGRectMake(0.0, 0.0, (CGFloat)width, (CGFloat)height), spriteImage);
// You don't need the context at this point, so you need to release it to avoid memory leaks.
CGContextRelease(spriteContext);
// Use OpenGL ES to generate a name for the texture.
glGenTextures(1, &spriteTexture);
// Bind the texture name.
glBindTexture(GLTEXTURE2D, spriteTexture);
// Speidfy a 2D texture image, provideing the a pointer to the image data in memory
glTexImage2D(GLTEXTURE2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GLUNSIGNEDBYTE, spriteData);
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glEnable(GL_BLEND);
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[EAGLContext setCurrentContext:context];
glBindFramebufferOES(GLFRAMEBUFFEROES, viewFramebuffer);
glRotatef(direction * 3.0f, 0.0f, 0.0f, 1.0f);
glClear(GLCOLOR_BUFFERBIT);
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}+I am using some sample code that currently displays an image 256x256 pixels. The code states the image size must be a power of 2. I have tried an image 289x289 (17^2)+
The phrase "a power of 2" refers to 2^x so your choices above 256 are 512, 1024 etc.
The texture size has nothing to do with the displayed size - OGL will stretch or shrink your texture to fit the size of the polygon you're displaying it on. I recommend you scale your image to 256x256 and work on make the polygon the size you want and work on your image quality from there.
You can work on the size or orientation of the poly surface to make it larger but OGL doesn't support setting a model to a screen image size or anything like that. That sounds more like a Quartz or CoreGraphics kind of thing if you want to set an exact screen size to the pixel.
HTH,
=Tod
PS You can display your code correctly by using { code } (without the spaces) on either side of your code block.
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