Questions tagged [exposure-correction]

Exposure Correction

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Simple function to simulate different shutter speed / exposure by changing RGB values of image

What mathematical function can I apply to each pixel of an image to simulate an increase in shutter duration of a camera? E.g. Let's say I have an image shot at 1/60s shutter speed. What function can ...
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3 votes
1 answer
78 views

How does the wireless flash protocol control exposure corrections?

The Panasonic Lumix series uses the wireless flash protocol developed by Olympus. The protocol features multiple groups of flash lights than can be controlled individually. I have a question regarding ...
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1 vote
1 answer
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I Dropped my nikon D3300 [closed]

A few days ago I dropped my Nikon D3300. I then found it is taking overexposed images while all the settings are correct. The meter in manual mode misguides me even in daylight. At ISO 100, f/5.6 it ...
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1 vote
2 answers
243 views

Where can I find color data for X-Rite ColorChecker Classic?

I would like to use the grey patches row of my X-Rite ColorChecker Classic to set correct exposure in post processing, but I can't seem to find the data for the chart on X-Rite website or elsewhere. ...
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3 votes
2 answers
398 views

Random EXIF data with same camera settings

I have a few problems with exposition with my Canon 70D: with same camera settings I get random EXIF data for focal lenght and aperture. This is the setup Table with white paper as white background....
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5 votes
4 answers
265 views

Fixed camera and light settings return different exposure

I have this situation while shooting still life photos of e-commerce products, lets say for example leather shoes or leather bags: Table with white paper as white background. Two strobe flash lights ...
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  • 201
1 vote
1 answer
107 views

Post-processing goal: three different exposures?

I took a photo yesterday on Roan Mountain, on the AT. In the foreground is an overgrown meadow. Midground is a nearby mountain, dark in contrast with the sun setting just over it. In the background, ...
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0 votes
2 answers
648 views

What is the formula to calculate aperture ("diaphragme" in French)?

Let's say I have these data for my camera: t : Exposure time in seconds ("temps de pose" in French) C : Incident-light meter calibration constant ("constante lumière incidente" in French) S : ISO ...
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-1 votes
3 answers
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Mathematical definition of EV on a RAW photo? [duplicate]

I'm trying to write a program that takes in a matrix full of 12-bit RAW sensor values (that range from [512-4096]) (512 is the BAYER sensor black level--> i.e. what pure black is defined as) and ...
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0 votes
1 answer
360 views

Change exposure settings while shooting with intervalometer

I own a Canon 77D camera with built-in intervalometer. I can set the interval in seconds between shots and set it to either shoot indefinitely or a fixed amount of shots. When I shoot the sunrise or ...
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2 votes
2 answers
325 views

How to programatically adjust exposure based on image metadata?

As part of a photogrammetry project, I took a number of photos (in NEF RAW format) of an object using manual settings on a D800. However, I forgot to turn off auto-iso (argh!). So, all my photos ...
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0 votes
1 answer
2k views

why exposing with 18% gray card does not give IRE near 40?

I am trying to understand how to get perfect exposure using gray card. With my Sony a6500 using ITU709 gamma, I locked exposure by doing spot metering on the gray card. When importing in final cut pro ...
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2 answers
482 views

Exposure compensation after images are taken

I have a stack of image tiles (taken from a drone) that I want to mosaic to a single image. I want to do exposure compensation to reduce the variation in illumination between the image tiles before ...
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2 votes
4 answers
242 views

Exposure correction for a portion of an image

I have a photograph that was taken on stage in a theater. The photo was taken with a Nikon D3100 camera with flash in auto mode and stored as both raw (.NEF) and jpeg file. Because spotlights were ...
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  • 21
-1 votes
1 answer
154 views

Can I save extremely washed out images in post-production?

I shot a ton of pics today, and trying out Auto vs Aperture settings on my D5200, I did not realize that the ISO was set to the outrageous number it was. I got home to find that about 1/2 the shots I ...
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4 votes
3 answers
2k views

How does software exposure compensation work in RAW files?

When shooting with RAW files, it is possible to tune the exposure and white balance using software, which is not possible when shooting with JPEG. But I have a stupid question: when you are shooting ...
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14 votes
6 answers
2k views

Could a "universal exposure" setting be practically possible?

Not sure how uneducated this question is, but I'm interested in learning, so thanks in advance for your indulgence. Film physically changes over the period of time it's exposed. A digital sensor, ...
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3 votes
2 answers
166 views

Method to balance very minor exposure changes over time?

Has anyone found an application for correcting extremely minor exposure changes over the course of a time-lapse? These are like +/- up to 0.05 EV or so changes, and they're pretty random in sequence, ...
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3 votes
2 answers
1k views

How can I undo Canon Auto Lighting Optimizer in Lightroom?

I was shooting in RAW in the Tv mode with my Canon's Auto Lighting Optimizer set to Standard. I understand this is one of the settings that, even when you shoot in RAW, will correct your image's ...
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0 votes
2 answers
688 views

Is light fall off corrected for in modern cameras?

Because of the way light is projected in a camera the image can be darkened near the edges. My questions is, do modern cameras attempt to correct for this light fall off? Description of the light ...
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1 vote
4 answers
259 views

How can I get the exposure correct in this picture?

I am new to photography; I have a Canon 600D. The shot below was taken using the 600D and EF-S 18-55 kit lens. I wanted to get the exposure so that the leaves on the big tree came out right, ...
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4 votes
4 answers
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Are the terms 'push' and 'pull' relevant/applicable to digital photography?

The terms push and pull come from the days of film processing, and there's more on that here and here, but essentially they refer to increasing or decreasing the chemical processing time to account ...
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4 votes
2 answers
1k views

How to fix the exposure of a snow scene which came out gray?

I’ve got a video and a photo shot in the same day and same place. But my camera (GoPro Hero 3, 720p) doesn’t allow to customise settings and video is very poor quality. I tried to fix this using ...
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  • 143
5 votes
3 answers
37k views

How to correct yellowish pictures under fluorescent lighting on a digital camera?

What can I do about some of my pictures turning yellowish under fluorescent lights - I can not turn the lights off - judo lessons for my grandson in school gym. I am using the Canon Rebel XSI (450D) ...
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5 votes
4 answers
4k views

How to correct exposure locally with Apple Aperture?

I have a question about using Aperture on OS X. I have taken a RAW picture (made with a K-5) of an arcade machine. While most of its surrounding is fairly well exposed, the lit areas are overexposed (...
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3 votes
2 answers
866 views

Why does the exposure vary in these Nikon flash photos?

The following 4 photos were all taken with a Nikon D300 at 1/250s, f/5.3, ISO-400, in shutter priority mode, with the on-camera pop-up flash. The only difference between them is the exposure bias, ...
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3 votes
2 answers
1k views

What is the difference between an exposure slider and a levels slider?

One of the first things many postprocessing tutorials teach is to adjust the levels in a raster image editor, so the histogram uses the whole possible range. In my RAW editor (Darktable), there wasn't ...
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7 votes
4 answers
3k views

How to correct photos which were overexposed at the edges only?

I'm dealing with a set of photos where a model was photographed against a white backdrop. The problem is that due to the setup, way too much light reflected off the backdrop. So the model's face (for ...
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2 votes
3 answers
1k views

In-Camera Bracketing vs Exposure Correction in DPP

Is there any difference in images produced using in-camera bracketing (-2,0,+2) and images produced using exposure correction (-2,0,+2) from RAW images in DPP? I'll be traveling tomorrow to a place ...
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8 votes
3 answers
1k views

Can spot metering be corrected in post processing?

I just started experimenting with spot metering + exposure compensation. I'm wondering if it's possible to make adjustments during post processing to correct the metering. I'm pretty sure (correct me ...
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