Questions tagged [jpeg]
JPEG is an adjustable "lossy" compression method commonly used in digital photograph. The most common filename extensions for images using the JPEG format are .jpg and .jpeg. Compare to alternative image formats such as TIFF and the various RAW formats.
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Good examples of RAW's advantages over JPEG?
I'm curious to see some real examples of where simply capturing the same photo in RAW (and being processed by someone who can do it justice) has significantly improved the photo at the end of the ...
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Why don't most cameras support PNG format?
I prefer PNG format to JPG, because JPG uses lossy compression.
When I capture a screen in my PC or scan a picture or document in my scanner, I always save them as PNG format.
If a camera could ...
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Are "Windows Photo Viewer" rotations lossless?
Can I rotate lossily compressed photos that I view in Windows Photo Viewer without worrying about losing even more information to compression?
user5306
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What quality to choose when converting to JPG?
When you export a picture to JPG you can normally choose its quality in a 1-100 scale. I like to keep a good quality but it wouldn't make sense to keep a JPG that will be almost as big as the original ...
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What are the pros and cons when shooting in RAW vs JPEG?
In general shooting in RAW format uses a lot more file storage than JPEG. What am I gaining when shooting RAW? Besides file size are there any downsides to shooting RAW?
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If an image is rotated losslessly, why does the file size change?
I was searching for methods of lossless image rotation and happened upon this question which explains it rather nicely:
Are "Windows Photo Viewer" rotations lossless?
So I created a 256×...
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Why store both JPEG and raw?
DSLRs often have the ability to store both a JPEG and a raw file.
Given that the primary benefit of in-camera JPEG over raw is the smaller filesize, and that JPEG+raw is going to store even more data ...
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What factors cause or prevent "generational loss" when JPEGs are recompressed multiple times?
For years, I've believed that recompressing JPEG files multiple times would gradually degrade its quality until they are an unrecognizable mess, the way making photocopies of photocopies does. This ...
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Why can I adjust the white balance of a RAW file but not a JPEG file?
I recently started setting my DSLR to save RAW files, and using Adobe Lightroom to process them. I still, however, use my little point and shoot camera a lot which does not have an option to save RAW ...
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Why do RAW images look worse than JPEGs in editing programs?
I've found that when you load a RAW image into an editing program such as Lightroom/Aperture, the image is usually worse than if you just took the image as JPEG. Now I understand that the camera does ...
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How can I add a border to a JPEG photo without affecting quality?
I have a photo in JPEG format with resolution 4680x3120. I want to add a white border around this photo, turning it into a 5200x3467 photo (for printing reasons).
Clearly, I am not altering or ...
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Why don't cameras support JPEG 2000 format?
The original JPEG format was updated in 2000 to provide a variety of features including less artifacts, better compression and lossless compression. Why haven't cameras updated to use this new format?...
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Is there a tool to check the file integrity of a series of images?
Sometimes when you're downloading an image and the connection breaks mid stream, you are left with a half downloaded image. If you try to view it you get the upper part of the image and the bottom ...
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What are jpeg artifacts and what can be done about them?
I know JPEG is a "lossy" compression algorithm that discards information in order to save space. What is the visual impact of this? I've heard of "JPEG artifacts". What do these look like?
Are there ...
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Does simply opening and closing a JPEG file decrease image quality?
I've had quite a few photography classes, read many photography books, and screened many forums. And I can't find a consistent answer to this question. One "camp" says there is a loss of image quality ...
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How to delete JPG files, but only if the matching RAW file exists?
My early (Canon G2) photos are all JPG, but when I got my Nikon D90 I initially shot in JPG, then switched to RAW+JPG, and now I would like to switch to RAW only.
I have literally thousands of photos ...
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What are the optimal JPEG settings for high-resolution Facebook photos?
With the current facebook photo uploader, what are the optimal settings for uploading high-resolution photos. I process my images in Adobe Lightroom.
I'm aware of a similar question asked in the past,...
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Does the dpi number reported by camera in JPG have any meaning?
I have two cameras, a 6mpix Panasonic FZ8, and 14mpix Canon A2200.
When I compare shots from two cameras, one of differences I notice is
dpi number that camera reports in JPG info:
FZ8 reports dpi=...
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How does Picasa process RAW photos?
How does Picasa decide how to process RAW photos? When I shoot in RAW+JPEG the two pictures can look dramatically different. Is it just converting the RAW files upon import, or is post-processing ...
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Should I use JPG or TIFF for high-quality prints?
I am putting together a photo book. I shot all the photos in RAW. The prints will be 300pi on 13x11 inch glossy paper. I am laying out the pages in InDesign, which doesn't allow me to import and place ...
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Why does JPEG quality go up to twelve?
Wwhy does the JPEG quality option in Adobe products go up to twelve?
Here's the option in the Save dialog of PS:
Thats a whole new definition of it goes up to eleven.
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Why use JPEG instead of RAW?
Why would a photographer want to capture images using the JPEG format over an available RAW format? The obvious argument is memory card storage, but assume that my available memory card storage is ...
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How can I convert an Apple iOS HEIF image into JPEG?
How can I convert an HEIF/HEIC image into a JPEG? Maybe using ImageMagick?
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Fix photo timestamps?
I took a bunch of pictures, and when I loaded them onto my PC, I discovered the time on my camera was set incorrectly. Now this normally wouldn't be a problem...but I am combining pictures from ...
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Can in-camera JPEG have image quality advantages over (third party software) converted RAW?
Question about RAW advantages over JPG made me curious if somebody has examples where in-camera JPEG is actually image quality-wise better than RAW image converted in computer (possibly by third party ...
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Does Flickr recompress JPEGs after upload?
Does Flickr recompress JPEGs after upload? I know that if you upload a TIFF, for example, Flickr converts it to JPEG. But do they also compress incoming JPEGs?
I've read some complaints about the ...
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Is it possible to find out what compression ratio was used for a particular JPEG?
I have a couple of JPEGs. Is there a way to find out which compression level was used when encoding them? That is, were they encoded at level 60 or 90?
The reason I'm asking is because I have a site ...
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Software that guesses which algorithm saved a given JPEG
Some time ago, I found a piece of software that would provide a good guess on the software/algorithm used to save a JPEG.
If I recall correctly, it would analyze something like the compression ...
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How does Darktable compare to Adobe Lightroom for editing JPEGs?
I mostly modify JPG images taken from my Nikon camera. How does Darktable compare to Adobe Lightroom for this purpose?
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Is there a lossy compressed file format for 16-bit dynamic range images?
I'd like to aggressively compress some scientific 16-bit grayscale image files, but without reducing the dynamic range. Is such a thing possible?
I understand that JPEG format uses lossy, and ...
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Why does the histogram of an image depends on the software that opened it?
If I open a raw image in Photoshop and Paintshop pro their histograms and their look is different. However, if I open a Jpeg image in both Software, then their histogram and look is the same. What ...
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Is Lightroom overkill for a JPG-oriented workflow?
I am a passionate not a professional,
I shoot most of the time in jpg because:
I usually don't have the time to process raw
raw takes a lot more space (and I feel my D700 jpgs are huge already!)
and ...
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Best way to import and save when shooting in both RAW and JPEG?
I currently use Picasa to manage my photos and when I import my photos I see "doubles" because I'm shooting in both RAW and JPEG.
I'm currently moving my raw photos manually to a folder outside of ...
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How to avoid jpeg compression artefacts when saving photos in web resolution?
When I save a web-resolution image (for example, 1920×1024px), flat areas tints often have damaged shades of color. I'm saving in Photoshop CS4 with quality 2 in standard mode, because I need the ...
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How can I easily convert a large number of pictures from RAW to scaled down JPG?
I have a collection of shots from the same session in RAW and want to covert all of them to JPG. Each one should have a curve applied, then be scaled and sharpened using the same settings.
What is ...
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Should I convert RAW to jpeg before making an HDR?
I've been going back and forth with this. I've been looking more into working with some HDR to just get a feel for the process. I have a 500D and I'm using exposure bracketing to take 3 shots. 0, -2, ...
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What is the "optimal" file size of JPEG images with respect to their dimensions?
I plan to write a script that will scan 100,000+ JPEG images and re-compress them if they are "too big" in terms of file size. Scripting is the easy part, but I am not sure how to categorize an image ...
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Two EXACTLY the same .jpg images with one image more than twice the file size of the other - Why?
I have a number of .jpg images which are EXACTLY (dpi, frame size, image) the same - except one is more than double the file size (in bytes) of the other. How can this be? When I zoom in by say 700% ...
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What were the optimal JPEG settings for Facebook photos in 2010/2011? [closed]
Every time I upload a photo to facebook I'm disappointed; the photos just look really bad. What size do you recommend, dpi, etc? If it helps, I'm using lightroom.
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Is it worth using Pentax's Premium JPEG quality setting?
Similar: How do I choose which resolution (megapixel) and compression (normal, fine, superfine) to shoot in?
The Pentax K-5 has a JPEG quality setting called "Premium", denoted by four stars, which ...
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Do jpgs have "layers"?
I have jpg photos with frames put on them which a friend made for me. I noticed when I open the jpgs though, that the image loads first and then the frame loads on top of it (that is, I can see the ...
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Can I do "back conversion" of a B&W JPEG to color?
I have a black and white JPEG. It is in fact an RGB image, which means that the color is still there. And I know from past experience that when I shoot B&W with my Canon, the color image is still ...
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How is the YCbCr color space represented in a JPEG image?
I know that a 24 bit image dedicates 8 bit each for R, G and B. Is it just for RGB color space. In YCbCr color space for a 24 bit JPEG image, how are the bits distributed?
user3720
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How can I detect upscaled photos?
I have a collection of JPEG photos, each 500 to 600 pixels on the longest side. How can I detect which ones have been algorithmically enlarged from a substantially smaller photo?
An online ...
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How to identify photoshop-edited files
If I have saved an image in JPG format after doing some edits, is there a way to identify that it is edited with Photoshop?
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How to delete "unused" raw files which have no .jpg match?
I shoot RAW+JPG, namely NEF and JPG. After viewing sometimes hundreds of images (using a simple program) and deleting the JPGs, I have many unnecessary leftover NEF files. If there was a script to ...
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How can I strip tags from a JPEG without removing the color profile?
For a while now I have used exiftool to strip away unnecessary metadata from jpg files (and to add copyright information) before uploading them:
...
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How to remove 'Program Name: Adobe Photoshop' from the metadata?
I've tried all the solutions from here as well as from stackoverflow, the tool mentioned (ExifTool) won't remove the metadata. I'd like to remove all the Photoshop information from my jpeg, leaving ...
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How to convert JPEG to RAW in Photoshop or similar?
I am having a competition in which I have to submit images in RAW format. But I have already clicked some images with Nikon D3200 in JPEG.Is there any way to convert JPEG to RAW format in Photoshop or ...
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Does JPEG-to-JPEG export Lightroom reapply compression?
I want to crop a JPEG file in Lightroom and export that cropped file to another JPEG so that I can e-mail it. The exported JPEG should have the same quality as the original.
I don't have the RAW file ...
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