|03 March 2005||#16|
Alan Taylor Smith
Salt Lake City, United States
hmm, interesting. That wasn't exactly the type of response I was expecting. but THANK you!
your link is broken though, could you post an updated one perhaps?
|03 March 2005||#17|
Join Date: Aug 2003
Sorry about that link... once clicked, at the top of the site there is a section called tutorials...
All those who believe in psychokinesis, raise my right hand.
|03 March 2005||#18|
Alan Taylor Smith
Salt Lake City, United States
Originally Posted by nataz: Sorry about that link... once clicked, at the top of the site there is a section called tutorials...
the link doesn't work at all for me, I get a error message
"the operation timed out when attempting to contact www.ict.usc.edu."
could just be me though
|09 September 2005||#21|
Join Date: Jul 2005
If you are looking for a powerful HDR image editor, HDR Batch Processor and a HDR Image Browser in a single application. Then Artizen ZE HDR is your only choice.
|11 November 2005||#22|
Join Date: Sep 2005
HDRI mega rescoure aimed at c4d i put together at c4dcafe.com =)
|04 April 2006||#23|
Rainer Maria Schmidt
Join Date: Jun 2005
I tried to make HDRI's myself and all looked mushy. So I tried a different approach. When my hightech mirrored ball highres camera hdri attempt failed I thought I might go as lowtech as possible. So... I loaded PS and created a black 2048x2048 background. Then I created a near-black circle. Just so I could see where it is. Really dark. Then I imagined how a spherical projection might look like and painted a few lights onto it with a smooth and not a hard border. Then I saved that versoin and two others. The other two were adjusted for intensity. One close to zero and the other one so it looked way over exposed. Then I used the very cool prog from www.hdrsoft.com to plop them together. The poor thing created a .hdr. AND it works like a charm and beats anything I tried manually with so much effort. I had to laugh about myself. The only thing.... of course.. it only can be used as background when you are after something abstract. Here is the file if you like to have alook yourself. I am sure I could also use MSPaint for that. No joke!
Here is the test hdri www.neophysics.com/images/testhdr.rar check it out. You can paint your own environments. Of course, nice and highres real world hdri are tough to beat. But this is cheaper than those expensive studio hdri's. Let me know if you had some fun with it 8-). The Background in my test render is the testhdr in this case. I had to set the exposure up to an f factor of 1.5 or the scene would have been to dark with that crude hdr. I was truly surprised about the result of the experiment. Better than expected.
PS:Render in XSI and no lights on except for that single hdri.
PPS: The gradients which make this pic look rather sucky are the result of the compression. They are NOT in the originals.
Last edited by LemonNado : 04 April 2006 at 02:10 PM.
|04 April 2006||#24|
Freelancer 3D generalist
Hdr Shop question
I tried to made my own hdri image, but I have question, I hope somebody will know the answer.. (I am used HDR Shop) I opened the assemble hdr image from ldr sequence window. I impoerted everything than I pressed the the button "calculate" under the calculate scale incrementstitle. After that I got that error message what is shown below. This means I did something wrong while I took the pictures?
|05 May 2006||#25|
Fort Collins, USA
Join Date: Nov 2003
I came across this, if anyone is interested....30 Hi-Rez HDR Maps (Free/Non-Commercial use)
R11.5 Studio| Mudbox 2010| AEPro CS5| 3DCoat Pro
Dual Quad Xeon 2.5GHz / Windows 7 x64 / 12GB RAM
|09 September 2007||#29|
Spring Valley, USA
Join Date: May 2007
Actually, RAW image files are still only 16bit and therefore still suffer from clipping that is inherent with all digital images besides HDR or scanned film.
What RAW does is to present you with a minimally processed digital image that represents the image that was actually passed over the image sensor of the digital camera.
It's alot more flexible than a jpeg or tiff file because it hasn't been converted to a traditional RGB image yet.
What you get is the mosaic image data as seen by the camera, no compression, very little clipping, and RAW actually has alot more data to work with.
It's direct benefits are being able to change the lighting model of the image, control and manipulate white balance, color temperature, contrast, and highlight/shadow values.
With HDRI, you are getting an image that can represent the dynamic range that's visible to the human eye.
Since it's values are 32bit in nature, you get much more variations of the light levels.
Your highlights aren't blown out so you can retain detail in them, and your shadow points aren't clipped so you can see detail in them also.
A regular digital image has say, 11-13 stops of exposure, an HDRI has maybe 18-26 stops, and a film image can have up to maybe 28 stops(give or take).
From a math perspective, your luminance values are represented in 32bit float mode.
Which means there are alot of 'in-between' values that are visible in the image that would automatically be clipped if those values were restricted to what's mathematically possible using an 8 or 16bit image.
It's somewhat similar to how 64bit computing architecture can address more memory than 32bit.
This makes the digital image close to what is possible with traditional film.
Film isn't math based, it's light sensitive material so it isn't subject to math values.
Film has what's called a highlight shoulder, which is a curve where the light levels subtly transition into each other.
Digital images don't have that. They either have certain values or they don't.
When you create an HDRI image, you take a series of bracketed exposure images that are a certain number of EV's(exposure values) apart.
You end up with over-exposed and under-exposed images that you layer and adjust blending modes so that each of the exposures transition more subtly into each other, which adequately simulates the 'highlight shoulder' of a traditional film image.
Just thought I'd throw this into the conversation since people were asking what HDRI is, and some of the explanations were vague.
I do a bit of photography and I've researched this subject extensively.
There's a technique in photography called tone mapping that generates an HDR image, but it isnt 'a light probe or cross probe but more of a half assed layered image with a few exposures blended together.
Some may have seen this, but maybe not:
Last edited by Dtox : 09 September 2007 at 10:59 AM.
|10 October 2007||#30|
ampthill, United Kingdom
Join Date: Oct 2007
www.3six0.net HDRI library Special Launch Offer
we have just launched a new hdri website called 3six0.net
i have attached a few pretty cool shots, with matching hdri's
we are also giving away a free hdri for every one who registers plus if you choose to subscribe you will get a free hdri each month plus 30% on everything bought through www.3six0.net
We would like to offer all readers from this forum a special introductory 50% discount to our annual subscription.
This will give you 12 free HDRI’s - One issued each month in your download box.
Plus a free mini gp model
Plus you will be eligible for an additional 30% discount to all your future purchase
And access to our subscriber area of the forum. Were will be posting tutorials and more free bits…
This usually costs £141 (GBP) per year but if you use the following promocode it will give you a 50% discount on your membership, that’s all of the above for only £70.50 (GBP) (this promo code will expire on the 31st October 2007)
Thanks for your interest
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