Post processing on low light/fast shutter photo

by numberwang   Last Updated July 11, 2018 11:18 AM

I'm trying to salvage a photo. It was taken in low light with a faster shutter speed. No matter what I do, it is always grainy. I'm interested in how to do this, not just getting it fixed. I use Gimp. Can you suggest how to do this? Attached is jpg file, but I do have the tif file. The tif looks lighter and grainier. enter image description here



Answers 5


I would suggest from my experience with GIMP starting by upping the brightness and the contrast, as that will substantially brighten the photo without too much painful noise.

Secondly, if you have more noise than you would prefer, I would suggest giving the plugin "wavelet denoise" a try, as it's a powerful denoising tool that -- if used correctly -- can reduce noise without the loss of too much detail.

Additionally, for an all around post processing boost, I would suggest GMIC which stands for GREYC's Magic for Image Computing, and is a plethora of plugins that can handle anything from sharpening to denoising to providing filters for your images. It's something that (in my opinion) GIMP should have by default.

Hope this helps you out!

Archibald
Archibald
May 23, 2014 03:16 AM

Most of my hummer shots are underexposed because I crank up the shutter speed on my Powershot SX160IS and I've found that LightZone (now free) does a fantastic job of recovering them.

Here's a quick LightZone recovery of your shot:

LightZone recovery

orlebar
orlebar
May 23, 2014 17:55 PM

Gladly. As you probably know one of LightZone's most powerful and useful tools is the ZoneMapper so I used a Style (i.e., filter) I found on the internet that uses ZoneMapper to increase exposure (I've tried making exposure adjustments with ZoneMapper myself, but I don't have the experience with it to get the best results). Then I added a Tone Mapper and increased the Gamma, then added a bit of Vibrance and Luminosity with the Hue/Saturation Tool, and finally added a High-Pass Filter to sharpen the midtones and highlights. It was all done in a few minutes. I don't notice a lot of noise, but then I process for print and I've read that noise can be mitigated with printing.

Sorry, I'm not accustomed to posting here so I didn't add this to my original answer. Lesson learned for the future.

numberwang: The ToneMapper is in the Style sidebar under the High Contrast category and in the Styles Menu under the same category.

orlebar
orlebar
May 23, 2014 19:23 PM

One thing you could try is converting the photo in RawTherapee using either of LMMSE or IGV, its two demosaicing algorithms optimized for noisy images. When I tested them against other RT algorithms and Adobe Camera RAW, they were clearly superior. I didn't see a significant difference between the two.

JenSCDC
JenSCDC
July 02, 2014 16:18 PM

I also use RawThereapee to process raw files. You can experiment with the different settings, including exposure and noise reduction.

The sample image can be processed from within GIMP.

  • Personally, I don't mind some "grainy" luminance noise. To convert chroma noise into luminance noise, I use median blur in copy of the original in a new layer with color blending. (In this case, skipped this step.)

  • Because the sample image contains mainly JPEG artifacts, I reduced blocking with jpeg2png. Then I enlarged the image with waifu2x.

  • I tend to avoid using the contrast and brightness tools.  I prefer to use the levels and curves tools. In this case, I deferred use of curves until later in the process.

  • To bring up the brightness, I used multiple copies of the original in layers with screen blending.

  • Increased saturation, very mildly. Made some small adjustments to curves to boost contrast.

  • Then used a Film Simulation from the GMIC Plugin (Fuji XTrans Pro Neg Hi) with the layer opacity reduced.

Here is the result:

result

xiota
xiota
July 11, 2018 10:35 AM

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