![]() ![]() It is likely that all texture maps will be in this form in the near future.Ĭurrently the final display buffer is 8 bits, and the floating point image is converted by multiplying by a constant and truncating. The EXR 16-bit format is now a standard and Nvidia is putting it into hardware on their boards. 000035 to 32768 (ie a contrast ration of over 1 billion), plus a gradual underflow area, +/-zero, +/-infinity, a full range of negative numbers, and several NaN values, all in the same 16-bit area that many images use for fixed-point. The EXR standard mentioned in the article is the same as IEEE 32-bit floating point, except the exponent is reduced to 5 bits, plus 1 sign bit, and a 10 bit mantissa (plus hidden 1). You can easily achieve human brightness resolution with a 16-bit number, appropriately used. HDR really means that floating point numbers are used instead of fixed-point integers. As the article states, the "blooming" effect is not HDR, it simply is blurring a white image and compositing it atop the original. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |