NightLight: 64k VT earth night texture

nardo · Post #21by **nardo** » 14.09.2016, 20:35

as always, you're the best

Added after 1 minute 22 seconds:
hopefully you wouldn't mind me continuing on this

FarGetaNik · Post #22by **FarGetaNik** » 14.09.2016, 21:10

John Van Vliet wrote:one is here
the 8 bit/Chanel red,green,blue colorized "64k.EarthLightsRGB.1.7.14.ppm.7z"

https://drive.google.com/file/d/0B6ZYAd08tZL-Wjg0a2pma2xUQmM/view?usp=sharing

Looking like an innocent 238 MB .7z archive, wondering why decompressing takes so long and BOOM we got 6 (!) GB image file :eek:

it is in .ppm format. Even if I knew how to read this file, it would be impossible for me to do anything with it. My computer would just die. horribly. :weirdface:

I guess thanks for sharing John, but by any chance is there a VT avaliable? But don't bother, nordo's texture is fine for me :wink:

John Van Vliet · Post #23by **John Van Vliet** » 14.09.2016, 21:22

ppm is "portable pixel map " the GNU version of MICROSOFT "Windows BMP" file

any image editor can use that format ( well maybe not Windows paint - MS dose NOT own the image format )

for big images i use Nip2 and have been using that editor for 10 years

nardo · Post #24by **nardo** » 15.09.2016, 04:35

oh i see now, this is the one from the motherlode. amazing work.

FarGetaNik · Post #25by **FarGetaNik** » 15.09.2016, 08:12

nardo wrote:oh i see now, this is the one from the motherlode. amazing work.

http://www.celestiamotherlode.net/catalog/show_addon_details.php?addon_id=1093
This one maybe? Well it's 32k. The original texture would be of higher resolution, right?

nardo · Post #26by **nardo** » 15.09.2016, 10:43

hmm... it definitely looks the same as the colorized one he posted...

nardo · Post #27by **nardo** » 17.09.2016, 01:11

i got bored and added a 1k-tile dds version to the original post

nardo · Post #28by **nardo** » 19.09.2016, 00:45

FarGetaNik

i quickly colorized and tiled the march data, maybe you could test drive it. i've already found some anomalies around australia but it's hard on a such a dim map. also, if you want a smaller version of the original data, i'll be happy to scale it for you. or you could get nip2 working on your computer (thanks for sharing that with us John).

below is the texture and ctx, straight out of my celestia. just tell the ssc to refer to "night0316.ctx".

John Van Vliet · Post #29by **John Van Vliet** » 19.09.2016, 01:03

the current nip2 .8.3 runs on Linux, Apple, and Windows
it is a bit odd to use at first
You can also use the terminal and vips ( nip is the GUI for the vips image lib )

on my 5 year old computer ( 8 gig ram) i have zero issues with a 24 gig image

nardo · Post #30by **nardo** » 19.09.2016, 01:22

yeah nip2 is working beautifully on my windows 10 with 8 gig ram. now i can finally take on stuff that hasn't been pre-tiled.

FarGetaNik · Post #31by **FarGetaNik** » 19.09.2016, 14:37

nardo wrote:i quickly colorized and tiled the march data, maybe you could test drive it. i've already found some anomalies around australia but it's hard on a such a dim map. also, if you want a smaller version of the original data, i'll be happy to scale it for you. or you could get nip2 working on your computer (thanks for sharing that with us John).

At first look it is even darker than your previous version. It seems some background level is lost, darker cities are hard to spot or missing. I'm not sure which version is more realistic, maybe a blend is the right solution? Regarding the tiles: Yes Australia's tile seems to be more south and I think the island of Java is missing, but I haven't found it anywhere in the ocean. But it is pretty much impossible to ckeck every tile in every level if it's on the right place. And despite being the same resolution it needs a lot more disc space. Checking your other versions I found DDS to be a lot more disc space intense. Ok performance seems noticeable better but I'd prefer jpg for size reasons...

I'll try nip2, maybe it really helps me. Lot's of stuff to do lately, I'll tell you the outcome.

nardo · Post #32by **nardo** » 19.09.2016, 17:05

thanks. i'm using the original radiance values so it's definitely the more realistic one, at least at suomi's altitude. the tiff contains a lot of information so you can boost it until the darker cities show up.

edit: also, i can have a jpeg version ready by tomorrow if you want.

FarGetaNik · Post #33by **FarGetaNik** » 19.09.2016, 17:38

nardo wrote:i'm using the original radiance values so it's definitely the more realistic one

So in this second version the brightness actually corresponds to the gamma-corrected brightnes? Wow that's something, I guess this is the most realistic approach. The average brighness is MUCH lower than in your original version, so it makes sense you used the full brightness spectrum (I guess so because some cities appear really white). At least it appears the texture neglected the dim cities entirely, maybe it's just flaw of dds compression (my home village is missing on this map, but not the previous one :biggrin:

) or they are lost because they have a value dark enough to be approximated by 0 (black).

I would love to see the jpg version, maybe it is really due to dds artifacts.