How can I create a usable HDR-style image from a single RAW file?
Asked 7/16/2010
7 views
2 answers
0
I know a true HDR blend from multiple bracketed RAW exposures is better, but I’d like to get the best possible HDR-style result from one RAW file when I only have a single exposure.
My attempts in Photomatix with default settings look very noisy, blotchy, and unrealistic. Are there capture tips for choosing or exposing a RAW file that works better for this? Also, what export and tone-mapping settings tend to help when generating multiple exposures from one RAW, and are there other tools that may work better for this workflow?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
16y ago
2 Answers
17
Ideally you want to capture at least 3 distinct images, but the more properly exposed your single raw image is, the better the outcome.
By proper exposure (a subjective term), I mean to expose to the right. You want to capture as much detail in the shadow areas of your image, without blowing out the highlights. The way dSLR CMOS sensors work, they do a much better job capturing information in an image that is slightly overexposed, than with an image that is underexposed (shadow areas will have more noise).
When you have your single RAW file, you want to hopefully create at least three images with varying exposure levels. Depending on your base image, these exposures may be -2/0/+2 EV or -1/0/+1 EV (as Marc's answer (and image shows)), or some variation of three exposure values--one that is less than your base image, and one that is more than your base image. You will need to play with the EV values until you get the intuition on what EV values will work with your base image.
When using Photomatix, try playing with the settings, the default values were never good. IIRC, bumping up the strength to full, and then tweaking from there produced good results.
Originally by user170. Source · Licensed CC BY-SA 4.0
user170
16y ago
0
Generated from our catalog & community — verify before relying on it.
A single RAW can only give limited “pseudo-HDR” results, so the source file matters a lot. The best candidate is a well-exposed RAW, ideally exposed to the right without clipping highlights. That preserves more shadow detail and reduces noise when you later brighten darker areas.
A common workflow is to export the same RAW multiple times at different exposure settings, such as -1/0/+1 EV or sometimes -2/0/+2 EV if the file supports it. Extreme exposure spreads can make artifacts worse, so try smaller steps first.
If Photomatix looks ugly with defaults, the settings are likely too aggressive. For a more natural result, use higher light smoothing and avoid extreme tone-mapping.
Another approach is exposure fusion rather than classic HDR tone mapping. One answer recommends developing two versions from the RAW—one optimized for highlights and one for shadows—and blending them with TuFuse. That can produce a cleaner, more natural image from a single RAW than aggressive HDR processing.
In short: start with a strong RAW, don’t push the virtual exposures too far, favor smoother/more realistic settings, and consider exposure-fusion tools if Photomatix is giving blotchy results.
Recommended products
UniqueBot
AI16y ago
Your Answer
Related Questions
How can I avoid haloing and white sky around a subject when making HDR from a single RAW file?
Can a single RAW file replace bracketed exposures for HDR?
When is HDR better than recovering shadows and highlights from a single RAW file?
Can a RAW file be turned into a better JPEG than the camera’s in-camera JPEG with one click?
Can Fujifilm X-T4 HDR-mode RAF files be split into the individual exposures?