Maxwell Render | Official public forum

not the coolest place in the world, but it's free for you guys to try it out


Could some one let me know if it has enough high dynamic range?

http://www.tereschubert.com/art/extra/test02.rar

BTW it's 6050 x 3025 dpi

Thanks Leonardo!!!! downloading, when I have a render with it I'll post it

Playing with it, it's a bit dark Leonardo

Here, I rebalanced it:

http://www.mikeverta.com/Posts/test02a.rar


_Mike

Perfect now

mverta wrote:Here, I rebalanced it:

http://www.mikeverta.com/Posts/test02a.rar


_Mike

Mike, how did you rebalance it?

my middle pic was the one that I posted... I don't get why it ends up like 4 f tops darker (I'm using hdrshop... and I have CS2)

ALSO... I know you use a lot of HDRI (like in the X-win render ) could you let me know, if what I did works how it suppost to?

how can I edit out the tripod if my image is a 32b?

ivox3 wrote:http://www.cgtechniques.com/tutorials/getridof.php

IVOX, I just looked real quick... and I coudn't see anything about working in 32bits... if I convert the image to 16 bits I can edit it with no problem... but wouldn I loose the magic of the hdri?

Leonardo wrote: Could some one let me know if it has enough high dynamic range?

nope, it has no high range at all. actually it's a clamped picture in hdr format, how did you build it?

It was 1 RAW picture that I didvided in 9 F-stops -4,-3,-2,-1,0,+1,+2,+3,+4 using cs-2.. instead of doing it manually while taking the photo. Then, It was compossed in hdrshop


leo

hmmi dont think RAW is truly HDR.. I think it may be 1 or 2 stop range but to get -4 to +4 exposure Raw will just aproximate it (from the clamped original RAW).. not truly caputure the range

can anyone fill in mor about what RAW dynamic range is?

That's not how it works... Leo's right. To build an HDR from LDR images, you normally take a photo at many f-stops and then tell the HDR assembler what the luminance range you're defining is, and it builds an HDR from that. But you can fake it by taking a single LDR and adjusting copies of it to "look" like you'd taken it at different f-stops. (You have to be clever about it, if you want it to look convincing at all.) The HDR assembler has no idea you faked the f-stop look in Photoshop, so given a particular curve, it will build an HDR just like if you'd taken actual photos at different exposures.


_Mike

mverta wrote: But you can fake it by taking a single LDR and adjusting copies of it to "look" like you'd taken it at different f-stops.

which doesn't make much sense, does it? there is no hdr that you can "fake" out of a ldr image, you just take a clamped range from 0 to 1.0 (and in leo's file doesn't even get to 1, it's clamped around 0.9) and store it in a hdr format.
sure hdr shop won't tell you there's not much of a hdr in that picture, but what you get it's not really useful. a photograph like leo's, if taken with multiple exposures and then combined in a hdr file, should contain, for example, information in very bright areas like the windows (which can't be taken in a single ldr picture where it's clamped to 1, and simply recorded as white). stopping it down you should actually see the exterior (which would have been correctly exposed shortening the exposure time), but in this case you don't get anything, just white fading into gray.

if you could fake like this, you could take a ldr output out of maxwell, working a bit with curves, exposure or whatever, and pretend to have a render which gives you all the dynamic range of a mxi.

3dtrialpractice wrote: can anyone fill in mor about what RAW dynamic range is?

they usually are 16bit files, and a single raw can't record all colours and intensities of an interior/exterior like leo's.

It's not a replacement for true bracketed exposures, but it IS an HDR if you do it that way, and it will behave as one. It just won't have the benefits or realism of a properly bracketed set of exposures-based map. Hence the term "fake."

_Mike