CODEWITHSUNDEEP
iosobjective-ccocoa-touch
NJGUY
NJGUY

Reputation: 2085

Ios unsupported color space error

When I try to load certain textures into my opengl app I get an unsupported color space errors for seemingly compressed .png files.

If I right click and examine the textures that fail, they have the following property.

color profile: sRGB IEC61966-2.1

The .png appears to get this property when it's compressed. I would really like to have this feature because it reduces the texture size by ~50%.

Here is my texture loading code:

-(GLubyte *) generatePixelDataFromImage: (UIImage *) pic{

    GLubyte *pixelData = (GLubyte *) calloc(width * height *4, sizeof(GLubyte));
    CGColorSpaceRef imageCS = CGImageGetColorSpace(pic.CGImage);

    CGBitmapInfo bitmapInfo = (CGBitmapInfo) kCGImageAlphaPremultipliedLast;
    CGContextRef gc = CGBitmapContextCreate(pixelData, width, height, 8, width*4, imageCS, bitmapInfo);

    CGContextDrawImage(gc, CGRectMake(0, 0, width, height), pic.CGImage);
    CGContextRelease(gc);
    return pixelData;
}

Here is the error:

Error: CGBitmapContextCreate: unsupported color space. Feb 14 13:11:59 Garretts-iPhone myApp[712] : CGContextDrawImage: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update.

Is there anyway to convert the texture programmatically whilst still having the benefit of reduced storage space?

Upvotes: 0

Views: 966

Answers (1)

rob mayoff
rob mayoff

Reputation: 385590

From the Quartz 2D Programming Guide:

Important: iOS does not support device-independent or generic color spaces. iOS applications must use device color spaces instead.

Have you tried just using CGColorSpaceCreateDeviceRGB as the color space? Does it look ok?

Upvotes: 5

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