Questions tagged [image-processing]
Image processing is the computational transformation of an image signal. It's about the technical side of batch transformations, conversions, and enhancements, as distinct from post-processing (adjusting an image to achieve a desired look, probably using image processing).
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Multi focal photos
I'm approaching to photography and I know from lessons of image sensing (satellite datas from engineering school) that exist the multi-focus image fusion. A sort of post processing combining multiple ...
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Measure the area of an object in an image by using fx and fy and given distance (distance between camera and object pixel-wise)
I want to measure the area of an object in an image. I have fx and fy of the camera and also since I am using depth camera I have the distance between camera and the object pixel-wise. Could you ...
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Command to find the "crop to content" dimensions?
Suppose we have a PNG file which is some meaningful content with black margins around:
GIMP has a feature called "Crop to Content" which will crop the black out and leave the content only.
...
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Samsung "Scene Optimizer" and EXIF data
Considering this earlier question Is it generally accepted that "Samsung 'space zoom' moon shots are fake" and that some cellphones (e.g. S20 Ultra) use AI to add features?
Leaving ...
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Is it generally accepted that "Samsung 'space zoom' moon shots are fake" and that some cellphones (e.g. S20 Ultra) use AI to add features?
a comment on my answer to What is the ring of light around the moon and which star seen near it? links to the reddit Samsung "space zoom" moon shots are fake, and here is the proof.
I have ...
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For what case is "Image sizing" in Lightroom relevant? [duplicate]
Prerequisite:
A digital picture is in my opinion only a sequence of pixels. e.g. in the .png format (simply explained) for each pixel, the color value and its position is stored.
So how big a digital ...
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Converting .CR2 raws to non-raw image format with ImageMagick mogrify makes images warm
ImageMagick's mogrify seems to be making my images warm-colored when I convert them to a non-raw format. Why is this? I've tried this with .jpg, .png, and .jxl.
I converted the same image with ufraw ...
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What type of editing is necessary to achieve this type of watch photo?
The first photo is mine and the rest are thewatchbox.com photos which I'm trying to replicate. Their photos have deeper colors and pop more. Mine seems to have a grey tone to it. Anything I can do pre ...
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How to avoid reflection in watch photos?
I use a cone made out of translum to take watch photos. This creates a reflection on the crystal/face of the watch. Is there a way to avoid this? I need these head on shots to look like the rolex ...
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How can I adjust the RAW (DNG) files from my FIMI X8 SE 2020 drone to achieve colors similar to the default JPG files?
I got a FIMI X8 SE 2020 drone a couple years ago, which has a good quality camera. However, when I shoot in RAW+JPG mode, I notice that the RAW (DNG) files have dull and distorted colors compared to ...
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RAW photos appear faded and overexposed in Lightroom Classic
In Lightroom Classic CC 12.2.1 (LR), I've noticed that my images look overexposed and faded compared to viewing them in FastRAWViewer (FRV). Below is an example from FRV:
And here is the same RAW ...
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Do Electronic Viewfinders Record Data?
I saw this post:
How does an electronic viewfinder work?
But I am more interested if the electronic viewfinder on a digital camera or smartphone saves image data before it is captured and written to ...
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How can I cut a long image into smaller images so that each image file size is below some threshold (e.g., 2 MiB)?
I have an image with a 1920x16883px resolution: I'd like to cut it into images of 1920xYpx resolution, with ...
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New to film processing, how do I order?
Hi!! So I’m brand new to film cameras and have my first roll that I want to send in for development. I have an order sheet printed out for Process One film developing but am confused on how to fill it ...
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Batch crop many images to certain ratio
I have over 2000 picture of various subjects and artworks that I want to crop to certain ratio depending on the closest defined aspect ratio.
The ratios I need are 1:1 and 7:5 and 1:3 They can be both ...
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How does a modern digital camera process to jpg?
All cameras capture their data off the sensor, then they might save the image in RAW, but can convert to JPG. A RAW file can be 12 or more bits, but a JPG file is only 8 bits.
What process does a ...
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Which has better accuracy? Average of N small pixels, or one large pixel
Starting point of this question is, for a hyperspectral camera in a satellite, where one is interested in macro level details to see crop health, water pollution issues etc. Is it better to go for ...
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How to remove flickering from image?
While taking photos at a wedding, I had flickering issues. One of the priests asked me to put my camera to silent mode and didn't notice that I'm taking photos with flickers then.
How can I fix the ...
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Advantages of complex demosaicing algorithms on images to be scaled down
Let's say I have a 20MP RAW image, that I know will be used scaled down. I can think of several reasons why I would know that for sure: it will be published on the web, it will only be displayed on ...
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Biological Image Sharpening/Processing
I am working on a bachelors thesis on electron irradiation of horse tendons. As part of the thesis I have to take measurement readings from images of the horse tendons taken using a scanning electron ...
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Batch processing scanned negatives to remove white border
I have had several hundred old negatives scanned by a local company. I am happy with the quality, but have found they are using a flatbed scanner to scan each strip, and then manually cropping each ...
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Do smartphones suffer from degrees of chromatic aberration? If so, how is it possible?
Smartphone imaging sensors are usually Bayer sensors which have a color filter array on top of each pixel, so each pixel ultimately captures one of red, green or blue colors of light. In that case,
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Is it common practice to apply identical processing effects to a batch of photos?
I'm trying to understand how photographers approach the task of multiple images that were all shot at the same environment/setting/event. Instead of opening each photo separate, and tweaking hue, ...
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Copying all photos with EXIF Rating >= 4 using ExifTool
I have used EXIF's Rating interval for ranking photos in my collection.
My photo collection is organized in directories in the form ...
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How to process photos of night sky taken from smartphone
I'm from Karachi, Pakistan. I'm very much interested in astrophotography but currently, being not much able to afford high level equipment, I try to work on my smartphone and learn from basic YouTube ...
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Open Source way to batch reduce export quality?
In Photoshop, we have actions, we can record macros and replay it on other images. One of the options I liked was that we can control the image quality when exporting jpgs.
I have stopped using ...
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Improving images for human vision
If human eyes are more sensitive to red, green more than blue, also more sensitive to brightness than color. If there are 24 bits per pixel, are the images modified behind the scenes for human vision? ...
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How to create a cardboard .vr.jpg file in Windows Shell (DOS batch script) using ffmpeg and exiftool?
Starting from this incredibly complex script I am trying to write a stripped down version which just creates a .vr.jpg file starting from one single equirectangular full panorama 360x180, but the ...
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How to fill with transparent color the empty space created by V360 filter of FFMPEG while converting from flat to equirectangular?
I am using this command to convert to flat a small region of an equirectangular image (BTW: how can I specify how much large the section is?):
...
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How can I compare histograms between a digital image and it’s print
I want to compare color histograms between a digital photo and its physically printed in cloth (like a T-shirt) version. The process is simple:
Printing a digital image (with good resolution) in a T-...
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What is the difference between raw and jpeg images? [duplicate]
I am a beginner at photography and I can’t really understand what a raw image is and how it is different from jpeg?
How is an image manipulated before processing?
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I have an image problem and I don't know what to call this
I wrote the article using a translator and hope you understand well, Sorry...
I am developing machine vision using basler camera(acA2440-20gm).
A problem arose during development.
The image contains ...
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How are focal lengths derived from camera calibration (resectioning) and pixel sensitive area related?
In camera calibration (camera resectioning process, e.g. camera calibration with OpenCV) does the result for focal lengths fx and fy depend on the photo-sensitive area inside the pixel ?
If I have a ...
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Is changing of width and height of smart object image by using free transform OR resizing of the image the same things?
I'm not very good in Photoshop tools, can someone help me to understand;
Is changing of width and height of smart object image by using free transform, OR resizing the image, the same thing?
If I ...
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Image properties for social media?
My experience of social media is extremely limited, but I have occasionally been asked by a group to send them an image for use on their media. Sometimes as non-technical people only used to mobile ...
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Filtering input files for Photoshop Image Processor
Is there a way to restrict the filetype that Photoshop Image Processor will process? I'm using CS6 and have a directory with a mix of RAW and JPG files, I only want to process the RAW files but can't ...
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What is the usefulness and best conversion software of TIFF file format for scanned slides
I will use an external provider to scan 1000+ old slides ("diapositives"), mostly family snapshots made a few decades ago. The provider offers by default standard definition jpg (512 x 340 ...
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Workflow to find original images in library
Background:
For some years I created my company webpage (tree farm) using a compromise between image quality and size generally using 300-500 pixel images. This was less than optimal for desktops, ...
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Are award winning landscape images edited?
I am on Flickr and 500px and also exploring award winning photographer's shots. They are beautiful, but I always wonder how much they edit their images? Can an image straight out from camera win an ...
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Remove haze from photos
I have a group photos taken on a humid beach that look really hazy. Is it possible to remove, using tools like Lightroom or something else?
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Best way to process an HDR image from JPEGs
I use an older digital camera for landscape images. It delivers very nice image quality - at least I like how it renders images. The point is that I cant take any RAW images. So when I shoot a sunset ...
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Full Well Capacity Questions
As I understand it, there are two potential limiting factors on full well capacity.
a) adc bit depth and gain,
b) pixel size and ability to absorb photons
Whichever is the smaller value (in electrons),...
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Why does GIMP increase the size of exported JPEG files?
I'm using GIMP to edit some vacation pictures (JPEG files) taken with a rather old digital camera. Lacking a professional background, I just went about by trial and error and ended up adjusting the ...
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Look Up Tables in Colour Science
I am looking into the colour science regarding lookup tables, and their application to images.
I am trying to find out what the values within the LUT actually represent.
...
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Open source Software to find and extract scanned negative frames from Kodak Disc and Minox negatives
I am looking for open source software that will find negatives on a sheet of scanned negatives and extract each one. Some of these negatives are Kodak disc, so the software needs to find rectangles of ...
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A more "professional" contrast curve than \$y = ax + b\$?
What curves do photographers use when modifying the contrast of their photographic images?
The simple equation \$y=ax+b\$ is sometimes with \$a\$ as "contrast" and \$b\$ as "brightness&...
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Computing the Focal Length
I have a course problem that asks to calculate the focal length of a camera with the following specifications:
Field of view along the horizontal axis (X): 60 deg.
Field of view along the vertical ...
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How to apply identical color curves to many pictures in GIMP?
I have a few thousand images that I want to apply the exact same color curve adjustment to. Is there a way to do this in GIMP? I found this How can I get a uniform white balance on a batch of JPEG ...
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Lens Magnification vs Pixel Magnification
Scenario:
I take a picture with a camera that has a crop factor of 3.19. I use a 55 mm focal length equivalent for taking the photo. In the resulting image file header, it says a magnification of 0....
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Watermarking processing proof
There are watermarking technologies in videos that are resistant to transcoding and image resizing. There are no visible artefact, it's rather for content protection and tracing.
Is there anything ...
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