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 <[email protected]>
> 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 <[email protected]>
>
>> 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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>>
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