moviepack matrix, crazy tronners, LOD and more by loops

Website · Post by **Z-Man** » Mon Jan 29, 2007 9:44 pm

Spooky

But let me be the nitpicker to point out that of course, it already was the world map before it got flipped

Jonathan · Post by **Jonathan** » Tue Jan 30, 2007 12:36 am

This is also a world map, but I did something to it. Can you tell what?

Source: http://earthobservatory.nasa.gov/Newsroom/BlueMarble/

Post by **Tank Program** » Tue Jan 30, 2007 1:17 am

That's pretty cool with the Matrix map

.

Jonathan · Post by **Jonathan** » Tue Jan 30, 2007 12:01 pm

I have re-uploaded mine, this time with a trailing tEXt chunk containing the answer.

Post by **epsy** » Tue Jan 30, 2007 4:51 pm

Jonathan wrote:This is also a world map, but I did something to it. Can you tell what?

it's smaller...

lol

Jonathan · Post by **Jonathan** » Tue Jan 30, 2007 5:11 pm

Yep, 10^-4 the area, and I assumed it is sRGB. But there's something else.

Kitsune · Post by **Kitsune** » Tue Jan 30, 2007 7:06 pm

You darkened it? From what I can tell, that's the only difference I see when swapping back and forth... (You used July, right?)

Jonathan · Post by **Jonathan** » Tue Jan 30, 2007 7:37 pm

Some of the darkening has to do with it.

Kitsune · Post by **Kitsune** » Tue Jan 30, 2007 7:51 pm

You made the ocean almost perfect black?

I give up.

Edit:

"I simulated the estimated transfer function of my LCD." I feel somewhat disapointed.

mattadams · Post by **mattadams** » Tue Jan 30, 2007 9:07 pm

well, i love ur moviepack, but the floors was just a solid blue, so i made a new one

Website · Post by **Z-Man** » Tue Jan 30, 2007 11:38 pm

"I simulated the estimated transfer function of my LCD."

Heh. Did you take the inverse of the transfer function of my LCD into account? I was expecting one of Jonathan's trademark image shrinking algorithms, really.

Jonathan · Post by **Jonathan** » Wed Jan 31, 2007 9:47 am

No, you're supposed to correct for your own LCD. I just took the GPU's LUT* and what it's supposed to make the final display like and inverted that.

*On OS X (since 10.3 or so) it's easy to do more than basic gamma→gamma correction. Its calibration assistant in "expert mode" is good enough to turn the final response of anything reasonable into something close to a power curve. There's more to complete calibration, but it's enough for this purpose (and the least you can do to get reasonable colors if the display doesn't fix its own response (like many built-in LCDs)).

Trademark image shrinking: this is effectively infinitely oversampled nearest neighbor. Doesn't need relatively complex caching to prevent having to keep the entire >10 GiB in a 4 GiB address space and 768 MiB physical memory (yes, I actually torrented some 500 m stuff a while ago and used it here), and doesn't look all that bad.

Kitsune · Post by **Kitsune** » Wed Jan 31, 2007 3:44 pm

But all that... and I couldn't see the difference at all.

[The LCD correction]

Jonathan · Post by **Jonathan** » Wed Jan 31, 2007 4:54 pm

Taking 5 samples isn't all that much work. In fact not enough to get truly accurate response curves. The result depends largely on how your display behaves by itself and what the default correction does.

I'll upload the reason world1.png has a 1 in its name for comparison.

<(@_o)> · Post by **<(@_o)>** » Thu Feb 22, 2007 11:08 am

..thats werid lol