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Posted 15 February 2012 - 11:17 PM
Posted 16 February 2012 - 07:10 AM
Posted 16 February 2012 - 07:52 AM
Posted 16 February 2012 - 05:31 PM
Posted 17 February 2012 - 04:23 AM
Thank you both.
I remember a topic from a few months ago in which I was accused of wasting my time reinventing wheels. It did take more time than I expected but it was certainly rewarding, and I was able to uncover some important facts that could be beneficial to a lot of people/companies when considering their image quality.
Mr. Gotanda was also not aware of the differences in how NVIDIA decodes their images, and by my calculations this special decoding method was very likely to have been invented specifically for the PlayStation 3. Had my company been aware of this difference before, the quality of their PlayStation 3 textures could have been improved.
The ATI results differ by more than 1 value in many places too, which suggests more than just truncation. I wish they would publish their decoding method. It’s not like it will help NVIDIA or anything, but it would help developers striving for better image quality.
If the ATI decompression method were exposed, then a “perfect” tool could be made to tailor to each of their decompression methods individually.
Posted 17 February 2012 - 05:04 AM
Posted 17 February 2012 - 05:32 AM
The format only allows one set of data per block. The format is simple in order to make fetches faster. The best route is to generate two images, but I am mainly thinking about consoles when I say that. If a PC game has too many textures it may be worth it to take the hit.
As for how noticeable it is, well, I certainly noticed it when I first tried it. Of course I had already been studying that image for a long while gathering all the types of artifacts that needed to be eliminated. But it is also more noticeable on some other images, especially cartoon ones.
That would be a possible way of going about it, but I will save that exercise for the reader.
Before leaving work today I pulled a coworker over to my desk. I said, “This is the original image. Below that there are 2 more images. One was made by my tool and one was made by ATI. Which one do you think looks better?”
He got close and stared for a long while, unable to decide. Finally he pointed at mine (unknowingly) and said it looks better because the “FREE-TO-PLAY PVP MMORPG” looks jaggier in the ATI result.
Posted 17 February 2012 - 08:09 AM
Posted 17 February 2012 - 08:20 AM
Posted 17 February 2012 - 08:35 AM
Posted 17 February 2012 - 07:48 PM