Hi,
I am facing a problem with OSG Image and would like to seek some advice from
the community.
I have a model exported in IVE format. This model is just a quad with a
texture mapped onto it. I want to retrieve the original image from
osg::Image object and convert it to JPG/PNG or any other format. Seems
simple, but I am not sure what is causing the problem.
The image when loaded using osgviewer looks perfectly fine. But when I debug
and look at the contents of the osg::Image object I find that both the
InternalTextureFormat and the PixelFormat are invalid.
_internalTextureFormat 33776 int
_pixelFormat 33776 unsigned int
The pixel size is 4 bits per pixel. I tried using osg::writeImageFile with
extension as JPG, TGA and PNG. Nothing works. With extension as RGB the
image is saved but is incorrect. I think it is because of the fact that the
image is 4 bits per pixel.
So, what I did is to use ImageMagick to convert the image data buffer to a
common format (JPG, PNG or TGA). However I am unable to do the conversion
from the 4 bit per pixel to a 24 bit per pixel. Any help here would be
greatly appreciated.
I am attaching here the IVE file for your reference.
My mechanism for conversion from a 4 BPP to a 24 BPP is as follows:
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
unsigned int total_size_in_bytes = image->getTotalSizeInBytes();
unsigned int row_size_in_bytes = image->getRowSizeInBytes();
unsigned int image_size_in_bytes = image->getImageSizeInBytes();
unsigned char* ptr = image->data();
unsigned int size = w*h;
unsigned char* writePtr = new unsigned char[size];
memset(writePtr, 0, size);
// i convert to byte array (not sure if this is the correct way to
do)
for(unsigned int i = 0; i < size; i+=2)
{
writePtr[i] = (ptr[i/2] >> 4);
writePtr[i+1] = (ptr[i/2] & 0x0F);
}
// now i have the byte array and i set to imagemagick
for (unsigned int y = 0; y < h; y++)
{
for (unsigned int x = 0; x < w; x++)
{
unsigned char c = writePtr[x+y*w];
Magick::PixelPacket* curMagickPix = 0;
curMagickPix = magickPixels + (y*w + x);
curMagickPix->red = c;
curMagickPix->green = c;
curMagickPix->blue = c;
}
}
delete [] writePtr;
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Regards,
Shamim
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