Спасибо за ответ, но я хотел не это узнать. В 2004-м симе dxt1- прозрачность, dxt3- блеск. А зачем ввели в в фсх dxt5 и чего с его помощью можно добиться? Вот что мне интересно.
gosha-z
01.06.2009 в 10:52
Хоть это и неправильно, но цитата из SDK:
DXT(n)
Using the DDS format, a user will be able to save images using several different compression schemes. These will allow the user to balance file size with function. The supported DXT(n) options, available using the NVIDIA DDS plug-in, are as follows:
Option Description
DXT1 DXT1 is recommended if the image in question employs a 1 bit Alpha channel (only Pure Black and Pure White)
DXT3 DXT3 and DXT5 should be used for images which employ 4 or 8 bit Alpha channels (16 or 256 grayscale levels). DXT3 and DXT5 both end up using the same amount of disk space when compressed, however the DXT5 compression scheme employs a better algorithm to compress the Alpha channel. DXT3 images can include some rather unsightly compression artifacts in the Alpha channel.
DXT5 Use the DXT5 option for any image where the Alpha channels bit depth needs to be 8 bit.
DXT2 and DXT4 do exist, however they are not supported.
AlexCher
01.06.2009 в 19:44
Спасибо. Как я понял, существенных отличий нет. Что 5-й, что 3-й формат. Разница лишь в так называемом оптимизированнойм качестве.
DXT(n)
Using the DDS format, a user will be able to save images using several different compression schemes. These will allow the user to balance file size with function. The supported DXT(n) options, available using the NVIDIA DDS plug-in, are as follows:
Option Description
DXT1 DXT1 is recommended if the image in question employs a 1 bit Alpha channel (only Pure Black and Pure White)
DXT3 DXT3 and DXT5 should be used for images which employ 4 or 8 bit Alpha channels (16 or 256 grayscale levels). DXT3 and DXT5 both end up using the same amount of disk space when compressed, however the DXT5 compression scheme employs a better algorithm to compress the Alpha channel. DXT3 images can include some rather unsightly compression artifacts in the Alpha channel.
DXT5 Use the DXT5 option for any image where the Alpha channels bit depth needs to be 8 bit.
DXT2 and DXT4 do exist, however they are not supported.