infarq

hi

i have just tested the file/automate/merge to HDR tool that comes inside photoshop CS2 and it's amazing

i found a lot of times troubles building hdri because ::
A sometimes you get saturated hdris for your environments
B even if you are very carefull with the tripod and the camera, some images are a bit moved concern to the next one
C if you are working with a not totally espherical probe you must to fill the areas of the photo that aren't useful for the hdri (see attached image)


CS2 make this easy ::
A you could make an action to desaturate a sequence of images for making the hdri ( this is not new)
B merge to HDR have an option to autoalign the images
C finally, you can modify areas of the images transforming the scale or whatever you need, then you can edit an hdri...

good luck with the hdri, ;-)

Attached Images

	test00.jpg (81.6 KB, 92 views)
	test00_2.jpg (81.7 KB, 92 views)

thomas+son

Thank you for the update on CS, I have been thinking about trying HDR again.My spheres were not perfect and it showed
Thomas+son

RyanSpaulding

Can you make HDRI images from normal pictures?

STRAT

i would have thought thats impossible as the original colour values would exist. but im sure it'll make a 'fake' hdr of it.

infarq

you could make manually a fake...

if you have a normal image, you could adjust brightness and levels in some parts of the scene in 2 or 3 steps but keeping bright some areas as sun reflections or lamps... this could be a fake of it... because you will be faking the underexposured images of the original.. the same with the overexposured images over the original image

RyanSpaulding

Is there any sort of guide/tutorial for turning a regular image into a fake HDRI?

AJLynn

I'd like to get into HDRI, but never used it before and not sure where to get started. Can somebody point me at a decent tutorial on the subject? How to take the photos, what to do with them once I have them, etc.?

infarq

this is the bible about hdri from its developer ::
http://www.debevec.org/IBL2003/debev...ain-slides.pdf

and for what you could use it.... buff... let me explain some concepts

hdri
high dynamice range image is a format that stores the power of lighting in an image, if you capture an image you cannot light and scene using that image because software only will understand 0-255 levels of white and therefore it will think that the white sun have the same power to light the scene than a white curtain or a white floor...
hdri is a format made from a sequence of several images made with different exposures showing in a low exposure photograph that only the sun remains in a white colour meanwhile the floor or a curtain becames dark

for what???
for achieving accurate reflections in reflective objects as windows.. take a look in this 3d image we made... ok, it's not really a good look but keep in focus looking in the sun reflection against the sky reflection, this is because the hdri of the bakcground "tells" to the glass that the sun is a lot brighter than the blue sky

Attached Images

det02_th.jpg (35.9 KB, 62 views)

STRAT

i personally think hdri is way over hyped. not many ppl actually know how to use it correctly and more importantly, effectivly.

infarq

yes, i'm agree, i started last year to shot hdri for some projects discovering that for reflections is a good choice but for lighting skylights for architecture viz i finally prefer to use a gradient ramp, more controllable and predictable