How to create Image from unsigned char *

Question

I am trying to create a new Image from raw data in unsigned char *. I have the bits per pixel from the data stored. I tried converting raw data into NSData, But result image

Answer 1

Try This :-

CGRect screenBounds = [[UIScreen mainScreen] bounds];
GLuint *buffer;
//point the buffer to memory location code that here accordingly
int backingWidth = screenBounds.size.width;
int backingHeight =screenBounds.size.height;    
NSInteger myDataLength = backingWidth * backingHeight * 4;


CGDataProviderRef provider = CGDataProviderCreateWithData(NULL, buffer, myDataLength, releaseScreenshotData);
const int bitsPerComponent = 8;
const int bitsPerPixel = 4 * bitsPerComponent;
const int bytesPerRow = 4 * backingWidth;

CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();
CGBitmapInfo bitmapInfo = kCGBitmapByteOrderDefault;
CGColorRenderingIntent renderingIntent = kCGRenderingIntentDefault;
CGImageRef imageRef = CGImageCreate(backingWidth,backingHeight, bitsPerComponent, bitsPerPixel, bytesPerRow, colorSpaceRef, bitmapInfo, provider, NULL, NO, renderingIntent);
CGColorSpaceRelease(colorSpaceRef);
CGDataProviderRelease(provider);

 UIImage *myImage = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);
 [uiimageviewobject setImage:myImage];
 [self addSubview:uiimageviewobject];

Answer 2

The following code creates a UIImage instance from raw pixel data assuming you have:

• pixelData: the raw pixel data
• imageWidth, imageHeight: the image dimensions
• scanWidth: the number of bytes per scanline
• bytesPerPixel: the number of bytes used per pixel, usually 4

The resulting UIImage is assigned to the variable uiImage.

CGDataProviderRef provider = CGDataProviderCreateWithData(
    NULL, 
    pixelData, 
    imageHeight * scanWidth, 
    NULL);

CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();
CGBitmapInfo bitmapInfo = kCGBitmapByteOrderDefault;
CGColorRenderingIntent renderingIntent = kCGRenderingIntentDefault;

CGImageRef imageRef = CGImageCreate(imageWidth,
    imageHeight,
    8,
    bytesPerPixel * 8,
    scanWidth,
    colorSpaceRef,
    bitmapInfo,
    provider,
    NULL,
    NO,
    renderingIntent);

UIImage *uiImage = [UIImage imageWithCGImage:imageRef];
CGDataProviderRelease(provider);
CGColorSpaceRelease(colorSpaceRef);
CGImageRelease(imageRef);