If I have to send Tri-x every time I F#@K up, I'd better buy in bulk.
I'm going to do without forgiveness, but try to be a good guy from now on.
going to pick up a roll or two of Tri-x today and shoot some b/w pictures.
Steven, some of us like worms.
Mark Barendt, Beaverton, OR
"We do not see things the way they are. We see things the way we are." Anaïs Nin
Paper doesn't take x stops of dynamic range on the film from the original scene, it responds to a density range, lower contrast neg can print more dynamic range using standard printing.
Originally Posted by E. von Hoegh
I believe what the OP is looking for is excessive local contrast.
Originally Posted by keithwms
Originally Posted by chuck94022
HDR combines multiple images into one, they are blended together, does not take portions of images. Exposure Fusion takes portions of differently exposed images of different areas and assembles those different areas into one image, like masking two different images together.
You can display "HDR" just fine, it will just be low contrast (also dynamic range has nothing to do with bits, and digital camera 'LDR' images have more dynamic range than the output device, eg one camera may have 5 stops, and another 10 stops, both display within the 0-255 range). What you are talking about is tone mapping, a HDR image displayed normally with 0-255 range will have low contrast areas, eg: foreground dynamic range may be 3 stops, sky may be 3 stops, but difference between the darkest area of the foreground and brightest area of the sky (total DR) may be 16 stops just as an example, displayed normally foreground would be black to dark grey, and sky would be light grey to white, making a dull image.
With (seemless) tone mapping, the idea is to display that foreground at black to light or middle grey, and the sky from dark grey to white, or with even more excessive contrast, the ground at a complete range of black to white, and sky also complete range of black to white without clipping of either end. Like masking, or well balance with a grad ND.
Basically, to extend the contrast of local areas to near the contrast of the entire image, or more excessive match it. So that the image is high contrast (LDR) instead of dull and low contrast (HDR). Also to match more what the eye sees, as the eye is self-masking and suffers chemical exhaustion to both high luma and saturated chroma, so you see each area at the same time with good contrast.
eg: I may take a beautiful sunset shot on colour neg film not using filters and relying on it's DR to capture everything that looks pale and low contrast compared to slide film I've used reverse grad ND on, and assumed slide looks better because it's slide, and colour neg is just pale with no saturation, but then I go back and shoot it again with a reverse grad ND on the colour neg to lower the contrast, by lowering the contrast I am raising the contrast of the image when the black corresponds with the darkest portion of the scene, and white with the brightest, on both.
Last edited by Athiril; 02-18-2012 at 06:52 AM. Click to view previous post history.
If you want the artificial HDR look, the way to do that would be a combination of careful exposure (so you get all the information you need on the film) and contrast masking. A contrast mask is made by exposing a piece of bw film in register with the original to make a precise dodging mask that is printed in register with the original neg to hold back the shadows and allow for extra exposure to get more detail into the highlights.
Historic printing-out processes like albumen printing are self-masking in this way and don't require a separate contrast reduction mask to achieve this effect.
I think this is an example of an artificial hdr look 1150 years ago
"There are a great many things I am in doubt about at the moment, and I should consider myself favoured if you would kindly enlighten me. Signed, Doubtful, off to Canada." (BJP 1914).
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Athiril, your post is so much more accurate than mine. Thanks for sharing your knowledge of this. I'm not terribly experienced in HDR, I was just interpreting what I understand based on my user level experience.
Sorry APUGers if my post was misleading in any way.
One suggestion, Athiril: with all due respect, your writing will be much easier to understand if you reduce the length of your sentences. While your content is correct, it is difficult to get to the essence of your point when so many concepts are pulled together into one sentence. In other words, your writing has High Dynamic Range, and at least in my case, my brain has Low Dynamic Range. (My father was a journalist. He drilled into me at a very young age never to write sentences longer than 21 words. I don't always succeed...)
Separately, totally agree with David G. on careful exposure and contrast masking. It seems there are also a number of simple things that could be done (with black and white anyway) using dodging/burning. It seems that one could dodge/burn incorporating colored gels on VC paper to affect local contrast too. I've never tried this. Would it work?