Hello,
I have make a new message, because I replied another message and it was
not so good. I hope this is ok.
Ok, back to my problem.
Mourad thanks for your help. I try it and it seems that I lose the half
image information. When I have a image 12 x 12 I get a image 6x6. I
think the problem is that the unsigned char* can only handle 8 bits.
Cheers,
Martin
Am 29.07.2009 15:58, schrieb Mourad Boufarguine:
Rather I would do this :
const long size = width*height*3;
unsigned short* data = (unsigned short*)calloc(size, sizeof(unsigned
short));
for(long i=0; i < size ; i+= 3)
{
data[i] = 65535; //red
data[i+1] = 0; //green
data[i+2] = 0; //blue
}
// image
osg::ref_ptr<osg::Image> image = new osg::Image;
image->allocateImage(width, height, 1, GL_RGB, GL_UNSIGNED_SHORT);
image->setOrigin(osg::Image::BOTTOM_LEFT);
image->setImage(width, height, 1, GL_RGB, GL_RGB, GL_UNSIGNED_SHORT,
(unsigned char*)data, osg::Image::NO_DELETE);
osgDB::writeImageFile(*image, "//home//.../test.jpg");
Mourad
2009/7/29 Martin Großer <grosser.mar...@gmx.de
<mailto:grosser.mar...@gmx.de>>
Hello Mourad,
ok, I can change it to GL_UNSIGNED_SHORT and I can change the
internal pixel format to GL_RGB16, but the data value is a pointer
to a unsigned char. Unsigned char is also 8 bit and not 16 bit?
Here the changed version:
const long size = width*height*3;
unsigned char* data = (unsigned char*)calloc(size, sizeof(unsigned
short));
for(long i=0; i < size ; i+= 3)
{
data[i] = 65535; //red
data[i+1] = 0; //green
data[i+2] = 0; //blue
}
// image
osg::ref_ptr<osg::Image> image = new osg::Image;
image->allocateImage(width, height, 1, GL_RGB, GL_UNSIGNED_SHORT);
image->setOrigin(osg::Image::BOTTOM_LEFT);
image->setImage(width, height, 1, GL_RGB16, GL_RGB16,
GL_UNSIGNED_SHORT, data, osg::Image::NO_DELETE);
osgDB::writeImageFile(*image, "//home//.../test.jpg");
What type is possible for the data value? And what happens when I
use GL_FLOAT? There are 32 bits?
My main problem is, I don't understand the data value.
Cheers,
Martin
Am 29.07.2009 13:25, schrieb Mourad Boufarguine:
Martin,
And for the second question, yes, you can use 16 bits per
channel. GL_UNSIGNED_BYTE means 8 bits per channel, so
GL_UNSIGNED_SHORT is for 16 bits.
Mourad
2009/7/29 Martin Großer <grosser.mar...@gmx.de
<mailto:grosser.mar...@gmx.de>>
Year! That is right. I feel awful about this mistake.
First I try GL_FLOAT and I forget to change the value from 1
to 255.
Thanks for your help.
Martin
Am 29.07.2009 11:39, schrieb David Spilling:
Martin,
I think you want this:
data[i] = 255; //red
David
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