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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How to separate the RGB colour space to only N colours?

In a JPEG image, we may have thousands of distinct RGB values. What is the process called of translating these numerous RGB values to just N distinct colour names/values? (I'd like to know the name ...
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Leica Q2M JPG files cannot be read by any of my Ubuntu (21.10) image software

I very recently picked up a Leica Q2M, and on my first attempt to read JPG files recorded on its storage media I've found that nothing on my Ubuntu 21.10 installation can read the files. I've tried ...
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Is jpeg or png the standard for fine art photography?

Is jpeg the predominant file format for fine art digital photographs, or what advantages would png have quality-wise that jpeg doesn't for photography, given that it takes up much more hard drive ...
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RAW to JPG conversion with reasonable automation

I'm new to working with raw images, since the Lumix TZ101 is my first camera which can output raw image files, and I'm struggling to make good use of them. I'm quite satisfied when I'm manually ...
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Jpg thumbnail showing larger than the original picture

I recently downloaded a picture from LinkedIn, and something really weird happens with it. Let me just state before that I can't show you the author asked me don't show it. So, if I do "read ...
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Why is JPEG the only compressed image choice in most digital cameras? [duplicate]

I've been viewing, editing, and storing digital images since before digital cameras were common -- I've used GIF, JPEG, TIFF, PNG, and a few other now-obsolete formats. GIF has been mainly relegated ...
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Corrupted Date Taken

Some of my older images are showing Date Taken later than the actual date that the camera took the image. The EXIF data shows the correct Date Taken in the field APP12::PictureInfo\TimeDate\...
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Does ETTR ( Exposing to the Right ) provide any benefit while shooting in JPG ? Or is it only beneficial when shooting RAW?

I generally only shoot RAW when shooting in tricky light situations. Otherwise i shoot JPEG . Should i be doing ETTR for the JPEG shooting as well ? Or is it only a technique that is useful when ...
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Image artefacts when exporting RAW to JPEG [duplicate]

I have a bunch of pictures in RAW format (.CR2) taken with a Canon EOS 1100D. When I view these files using Windows Photos app the images look great, however when exporting to JPEG using RawTherapee ...
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7 answers
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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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ExifTool does not extract corrupted EXIF metadata from jpeg file. How to repair it?

The image viewer nomacs offers a quick way to add image notes via Exif.Image.ImageDescription metadata. After having edited the form for my-image.jpg, I can see this property in nomacs and Thunar (...
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What's the best format for pictures in order to have the most metadata?

Working with a smartphone, I've seen that JPEG shows a lot of information in the EXIF, where PNG not as much. However JPEG does some compression on the image which I'd like to avoid if not necessary ...
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How to delete all metadata from all JPEG files in folder using ImageMagick? [duplicate]

I have many JPEG files in folder D:\folder. I want to delete all metadata from all JPEG files in this folder. I used ImageMagick. I made: magick mogrify -strip "D:\folder\*" Am I right?
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Photo noise level in RAW format [duplicate]

Why is the noise level of raw photos higher than jpeg photos? I have encountered this issue several times.
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2 answers
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Metadata: UserComment, ImageDescription, Description; what's their purpose?

$ exiftool test.jpeg | grep 'This is' Image Description : This is the 'ImageDescription'. User Comment : This is the 'UserComment'. Description : ...
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498 views

Suggestions for an easy way to add gps data to jpegs

I am looking for an easy way to add locate and add GPS data to JPG files on a Mac running OS Catalina. I would like the photo data to be able to be recognized in iPhone picture maps and location ...
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Is there a common subset of exif metadata tags for scanned photographs?

I've recently been scanning a collection of photographs into jpeg files. I know how to use tools such as exiftool to examine and change metadata tags. But while I'm easily able to learn the technical ...
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4 answers
339 views

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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2 answers
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Finding raw & jpeg files in my computer photos library

I have a Panasonic FZ1000 and took some photos on the raw & jpeg setting. On my computer the photos are identified as jpeg, but on my iPad they are identified as both. There is only one file ...
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2 answers
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Capture one to export a progressive jpeg?

As far as I can tell, Capture One doesn't have the option to export an image as a progressive jpeg. To get a progressive image, I've been compressing once on export, and compressing again on the ...
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2 answers
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Can jpg be converted to progressive jpg without quality loss?

My understanding of a progressive jpg is that it saves the color information of each pixel in a different order, to create the progressive loading effect. I.e. instead of RGB RGB RGB ..., it's saved ...
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How will the image be displayed/interpreted if I publish a JPEG online with no embedded color profile?

How will the image be displayed/interpreted if I publish a JPEG online with no embedded color profile? I use GIMP 2.10 on Windows 10 Home 64-bit.
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5 votes
4 answers
873 views

Is there a way to delete all RAW files if a corresponding JPG file exists?

I'm starting the process of importing hundreds of thousands of photos into a new DAM system that my company purchased. There are 46,000 RAW files (mostly .cr2). We don't need the RAW files anymore. ...
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1 answer
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.jpg photos from the external SD card of Galaxy Grand Prime + display "It appears we don't support this file format" after transferring them to my PC

My Galaxy Grand Prime + phone was running out of space so I transferred all my WhatsApp media to my SD card. After some time (a few hours I think), many of these photos and videos became unviewable. I ...
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Why are thumbnails bad, when jpgs are good, with raw processed with darktable?

I'm using darktable to process my raw photos and save the final jpg's. I'm on ubuntu linux. From some of the jpg's, gthumb gets thumbnails which are far lighter than the original jpg, and the same ...
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1 vote
1 answer
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Different image viewer shows different color (brightness?) of jpg image

I'm not sure if I should ask this question here or not. I've some images, that have a problem, as the screenshot below shows: The softwares are as following (left to right, top to bottom): [qimgv] [...
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6 votes
1 answer
164 views

Why is the night sky photo showing uneven color and strange pattern in background?

Here's straight-out-of-camera JPEG I've shot with Fujifilm XT-2 with following details: f/2.8 15 seconds ISO 3200 XF 16mm f/2.8 R WR Upon closer inspection I noticed: Left area is noisy possibly ...
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2 votes
2 answers
198 views

Edit in RAW not as good as the Jpeg

I take most of my pictures on mobile, and I use mostly jpeg for the convenience, but I sometimes use RAW because of annoying whites blowout, bizarre clouds or unreal colors. For instance, my sunset ...
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3 votes
4 answers
520 views

GIMP: Why can I set a higher quality than original image in the "Export Image as JPEG" dialog?

After having read the GIMP Export Image as JPEG section, I still have one understanding issue: Why am I able to select a higher quality value than the one from original image in the export dialog? For ...
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Does a TIFF file using JPEG compression have the same 65535 x 65535 pixel limitation as a JPEG file?

TIFF allows for JPEG compression, among others. While it is not a well-explored option (most people just opt for lossless compression), I am looking to use it as a similar-size alternative to JPEG, ...
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1 answer
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Why does zooming into JPEG images show chunky boundaries and or noise resembling smudges of magenta, yellow and cyan?

What causes this effect? The boundaries look chunky and weird. I never seen this on PNG. I also have noticed this for JPEG images only, not PNG. For example these captcha images. The skies don't ...
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0 votes
1 answer
648 views

Wrong DNG colors but correct JPG. How can I "transfer" correct colors to the DNG?

I have a Fimi X8 SE drone and it has a RAW DNG (+ JPG) capture mode. The only downside to this is that the DNG files are somehow "broken" because all colors seems to be wrong. Strong magenta ...
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2 votes
1 answer
119 views

Rating a JPEG in Lightroom Classic 9.2.1 causes the JPEG file date to change to today

I have a full drive of old JPEGs from the early 2000's (Canon A20) that I have added into a LR catalog. I have unchecked the catalog settings "Include Develop settings in metadata inside JPEG, ...
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2 votes
1 answer
627 views

Why do JPEG and TIFF versions of image look different?

I noticed something that probably is good but looks bad in my opinion. I pixel peeped an image to compare the Jpeg vs Tiff. Both are exported with Lightroom from a raw file. I only changed the file ...
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2 votes
2 answers
202 views

Lightroom: how to not lose quality by exporting a photo from a previously exported photo collection?

I'm thinking to use Lightroom in order to organize catalogues by year (to avoid having large areas of files that I normally have in the cloud and download locally to work them). Having catalogs per ...
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1 vote
0 answers
86 views

JPG files - different brightness in viewers

I have a single JPG file. If I open it with IrfanView, it is darker than the same file opened in PhotoShop (or in Firefox). What can cause this? The correct version is the one from Photoshop (or ...
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1 vote
4 answers
912 views

Should I convert my family pictures from JPEG to PNG?

I have a lot of family pictures saved in Google Drive as JPEGs - not JPEG 2000 - as they were initially acquired. I thought the problem with JPEGs was artifact at sharp edges, which is not too much ...
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0 votes
2 answers
221 views

how to send an edited RAW photo to a lab for processing without it automatically being converted to jpeg & loss of data

How to send an edited RAW photo to a lab for processing without the RAW file automatically being converted to jpeg & loss of data.
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6 votes
1 answer
257 views

Restoration of a corrupted JPEG file

I wonder if there is any way to restore corrupted JPEG files in my situation. Duting copying of files from camera SDD card I had some kind of problem/mistake with few files, but I was able to repeat ...
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3 votes
2 answers
183 views

Convert large database of mixed-format files into screen size jpegs

I am an older photographer with an ever-increasing collectiob of 20,000+ images in folders arranged by year and month. (they are currently catalogues in Lightroom and the bad, non-interesting photos ...
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1 vote
3 answers
159 views

What is this weird JPEG TIFF hybrid image and how can I save it from PS as a normal JPEG?

I have this JPEG image saved out of PS using "Save As" and selecting "JPEG". It's abnormally large for it's WxH resolution Mac Preview's info shows it as an uncompressed TIFF Trying to save it out of ...
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1 vote
2 answers
958 views

Is editing metadata of a JPEG destructive to the image?

Is editing metadata of a JPEG destructive to the image? If I edit "File Info" > "Description" in Photoshop, then save.... am I causing the same image degradation as if I edited the image, then re save ...
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1 vote
1 answer
544 views

How to batch convert old NEF photos to JPEG/HEIF with in-camera processing look?

I have ~9k NEF photos from a Nikon D5000 that are currently taking up ~100GB. It's been 8+ years without me touching them, so I don't see a reason to assume I will ever process and edit them. I'd ...
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1 vote
1 answer
710 views

How to compress RAW RGB 10-bit data?

This might seem like a general question, however I could not find an answer for. Specifically, I am using a CMOS image sensor that has the following general capabilities: Array Size: 1280 x 1024 (...
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0 votes
2 answers
268 views

Does using M or S size JPEG helps with lowering noise on High ISO?

AFAIK, image sensors use demosaicing algorithms to reconstruct virtual image pixel from different sub-pixels. Does it mean, that on some cameras it could be profitable to use lower-resolution modes to ...
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1 vote
3 answers
669 views

Looking for a fuzzy image comparison tool (not online, but for harddrive search)

I am looking for a programm, that compares screenshots from documentaries with a (very small) number (around 600) of source screenshots (from the footage they originate from). The differences between ...
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3 votes
4 answers
6k views

Changing JPEG to RAW to use on Lightroom?

Am I able to covert JPEG into RAW so I can treat the images on Lightroom? Reason why is that for years I am travelling and taking tons of pics but my Nikon was programmed only to save in JPEG format.. ...
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3 votes
3 answers
3k views

Fast, lossy compressed, 10 bit image format (Or 12 bit or 16 bit)

I'm looking for an image format to keep my photo archive. Currently I'm keeping compressed DNG + 80% quality JPG. JPG is useful because you can easily convert and manage, is small and is fast to read/...
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0 votes
2 answers
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Force Lightroom Classic to write entire image at once during export? (Exporting to network-mounted GCS bucket)

I'm running out of space on my local machine so I've mounted a Google Cloud Storage bucket to my local machine using gcsfuse. I am now exporting my library from Lightroom Classic as JPEG files to the ...
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1 vote
2 answers
327 views

How to determine which jpeg is closer to the original image and has the most information?

I've got two jpegs of the same photo of different sizes and attributes. How can I tell if one is the original taken by an iPhone4 or if neither is the original, determine which has the most ...
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