Magick++: Can't open UYVY BMP

[jpardos]

Hello,
I am trying to read a blob from memory which has a 16 bpp BMP encoded in UYVY.
I'm using it in directshow; I read the BimapInfoHeader from a IMediaSample, write my own BITMAPFILEHEADER, then copy the BITMAPINFOHEADER as follows.

Code: Select all

	const int SZ_BMP_HEADER = 54;
	[...]
	//BITMAPFILEHEADER
	_this->m_pDatos[0] = 'B'; _this->m_pDatos[1] = 'M';
	*((int*) &_this->m_pDatos[2]) = _this->m_szDatos + SZ_BMP_HEADER;
	*((short*) &_this->m_pDatos[6]) = 0;
	*((short*) &_this->m_pDatos[8]) = 0;
	*((int*) &_this->m_pDatos[10]) = SZ_BMP_HEADER;

	//BITMAPINFOHEADER
	*((int*) &_this->m_pDatos[14]) = _this->m_BMIHeader.biSize;
	*((int*) &_this->m_pDatos[18]) = _this->m_BMIHeader.biWidth;
	*((int*) &_this->m_pDatos[22]) = _this->m_BMIHeader.biHeight;
	*((short*) &_this->m_pDatos[26]) = _this->m_BMIHeader.biPlanes;
	*((short*) &_this->m_pDatos[28]) = _this->m_BMIHeader.biBitCount;
	*((int*) &_this->m_pDatos[30]) = _this->m_BMIHeader.biCompression;
	*((int*) &_this->m_pDatos[34]) = _this->m_BMIHeader.biSizeImage;
	*((int*) &_this->m_pDatos[38]) = _this->m_BMIHeader.biXPelsPerMeter;
	*((int*) &_this->m_pDatos[42]) = _this->m_BMIHeader.biYPelsPerMeter;
	*((int*) &_this->m_pDatos[46]) = _this->m_BMIHeader.biClrUsed;
	*((int*) &_this->m_pDatos[50]) = _this->m_BMIHeader.biClrImportant;

When converting the Blob to an Image, I get an exception, which says:

SYSTEM32: unrecognized compression `' @ bmp.c/ReadBMPImage/805

If I write a 0 in m_pDatos[30], then everything works fine m_BMIHeader contains 'YVYU' )
I'm using ImageMagick-6.4.9-Q8 on Windows XP
Do I need a plugin or something?
Thanks.

[magick]

Can you write your image to disk and post a URL so we can download it? The problem is simple. Either your BMP image is corrupt and it is compressed with an algorithm that ImageMagick does not recognize. ImageMagick handles compression values of 0, 1, 2, or 3.

[jpardos]

That's the problem, then. It has a compression value of 'UYVY' (0x59565955), which really is not a compression format but an encoding one ( http://msdn.microsoft.com/en-us/library ... 85%29.aspx ) so if I change it for a 0x0, ImageMagick recognizes it correctly, but the colors are wrong. I need to read it from memory and write it compressed as JPEG. Isn't there any workaround?

Thanks anyway for your quick response