Questions tagged [jpeg]
JPEG is a lossy-compression method for a digital image. The images can end up in many JPEG image containers (JPEG, JPG, JIF, JPE, JFI, JFIF) depending on the parameters surrounding the compression of the image data. JPEG is actually an acronym for Joint Photographic Experts Group, the group that created the compression standard for JPEG.
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Batch converting PNG to JPG in linux
Does anyone know a good way to batch-convert a bunch of PNGs into JPGs in linux? (I'm using Ubuntu).
A png2jpg binary that I could just drop into a shell script would be ideal.
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Meaningful thumbnails for a Video using FFmpeg
FFmpeg can capture images from videos that can be used as thumbnails to represent the video. Most common ways of doing that are captured in the FFmpeg Wiki.
But, I don't want to pick random frames at ...
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Opened a JPG picture with notepad, pasted all the "text" to a new notepad file, changed to .JPG and it no longer opens. Why?
This phenomenon has been leaving me questions to ask.
Here is the detailed experiment, my OS is Windows 7 x64 SP1:
I changed a picture (JPG) file to TXT by simply changing its extension (or one ...
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Removing Background color in Paint.net
I have a .jpg image of a text logo, it looks similar to the example image here:
I am using paint.net.
Now, I would like to change the image to .png, then I would like to remove all the white ...
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Convert a bunch of BMP files to JPEG on Linux
Someone sent me a bunch of BMP files and I need them in JPEG. I could convert them one by one using GIMP, but I'd rather do it all in one go. I have Ubuntu.
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JPEG vs PNG vs BMP vs GIF vs SVG
I would like to know which one of these formats requires less memory for the same quality of the picture, and what are the main differences between these formats.
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Search for a JPG on my computer by using a smaller JPG?
I have a low resolution image that I know I have the full resolution image stored somewhere on my computer. Is there anyway to search for a JPG on my computer by using a small resolution of an image ...
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Why does Google Chrome save a JPG image to WEBP instead?
I'm trying to save what appears to be a JPG image from Chrome and always end up downloading a WEBP image instead.
I'm on Chrome Version 80.0.3987.163 on macOS Catalina (10.15.4) and I'm trying to ...
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How to convert a photo to a black and white image by ImageMagick?
How can I convert a JPEG photo to black and white (not grayscale) image like output of a FAX scanner, by ImageMagick?
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How to disable WebP images in Chrome?
Google Chrome sometimes takes a .jpg image and converts it to a .webp file.
The problem is that when I save this image to file, I cannot open the file. I have tried manually changing the extension of ...
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What is the largest size of a 640x480 JPEG?
I'm creating a data storage device that takes a certain number of pictures of the night sky over a couple of hours, and the pictures will be downloaded right after they are all taken. The memory card ...
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How can I modify the EXIF orientation tag of an image?
I want to change the EXIF orientation tag in my JPEG images but without actual rotating of them. I want to do this to use them as a test case for an application I made.
How I can do that in Linux? ...
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How to find the JPG quality?
When I save a JPG file with GIMP, I can adjust the quality I save it at, from 0-100 (I use 89). It seems like I've used an app to see what this number was on saved file but if I did I can't for the ...
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Is there any drawback to just renaming jpeg files to jpg?
A client sent me many jpeg files that I'd like to rename to jpg. Is this just a matter of renaming them, or should I open them with an image editing program and then saving them as jpg?
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Stop Windows 8 from converting wallpapers to low quality JPGs
This has been bugging me on Windows 7 as well, and much to my chagrin Microsoft didn't bother addressing that issue in Windows 8.
Take this image for example:
(Click to open original unaltered image.)...
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How to batch combine JPEG's from folders into PDF's
I have a about 500 folders with images inside. Is there a way I could batch convert this so that I get .pdf files that contain all images inside as pages?
EDIT:
There should be 500 PDF's created, ...
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Editing JPEG EXIF properties
How can I edit EXIF properties of JPEG files on a Windows machine?
Some image editing utilities handle the Rotation property wrong, which leaves me needing to make manual edits after rotating images ...
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How do I batch convert thousands of NEFs to JPEGs?
I accidentally set my camera (a Nikon D70) to shoot in NEF only and not NEF+JPEG.
Obviously, this will be a major pain when I want to go through them all. I don't envy having to wait for seconds at a ...
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How to convert GIF files to PNG or JPEG in OS X with command line?
I have 10k+ GIF files that I need to convert to PNG or JPEG preferably using command line so that I can automate it. I'm not worried about losing quality or transparency, just need to prepare files ...
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How can one bulk time-shift the creation date of JPG images? (OS X)
I have an unfortunate situation following a vacation. The gist is this: 2 cameras, with Camera #1's clock being two days ahead of Camera #2. Therefore, in (Insert Photo Management Application Here), ...
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Is there still any reason to prefer GIF over PNG when creating images for web pages? [closed]
Long ago, I used to avoid the PNG image format when building web pages because browser support was lacking. I remember having a PNG on a page could cause the QuickTime plugin to be loaded - yuck.
...
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How do I edit a JPEG's EXIF data with Gimp?
I would like to edit a JPG EXIF data in Gimp. Perhaps I need a plugin or something, but I don't know how to search for and download the plugin. Plus, when Gimp opens a JPG it converts it to XCF format....
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How to automatically rotate images based on EXIF data?
I know how to do it manually. Now I would like to automate that based on EXIF data.
I already have exiftool installed, but looks like it can only read the data, but can not rotate the image.
There is ...
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How to repair broken JPEG files?
I have some JPEG files which have some colours wrong after a certain point and also every pixel is shifted to the left. I think this is because of some missing bytes at the point where it changes.
I ...
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how to change the dpi of an image
I have an jpeg file of 300 dpi. I need to reduce it to 200dpi. How can I do that?
Do I need any specific application or it can be done using Picasa/paint/MS picture manager, if yes how? Thanks
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Is it possible to change orientation of JPG image without rotating it (and thus losing information)?
As JPG is a lossy compression, every re-encoding losses quality. Thus, 90/180/270 degree rotation is a lossy operation as well. Is it possible to change orientation of JPG photo by changing some of ...
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Can we change size of an JPEG image with out decoding and re-encoding it?
I want to convert a 640x480 JPEG image to 320x240. I know it can be done by decoding the JPEG image into raw YCbCr, scale it and re-encode it into JPEG. But is it possible possible with JPEG encoding ...
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Fastest JPEG thumbnail generator for Linux
I'm looking for the fastest command-line image converter for Linux which can read a JPEG image, scale it down to at most 1366x768, and write a quality 50 JPEG image. Something like this, but much ...
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Batch convert multiple PDF to Image on Mac
What would be the quickest way to convert a bunch of pdf files to jpeg files? I know I can open Preview and Save As image, but that could take a long time.
RdSchull
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Progressive JPEG quality compare to normal JPEG?
I'm trying to convert some BMP files into JPEG format at highest quality (Q = 100) until I realize there is a "Progressive" option here.
One of my BMP file is 2.9MB. After converting to JPEG format ...
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Losslessly compressing similar images?
I need to reduce the size of my photo library so I naturally want to compress them. Many of them are not quite identical, but still very similar (subsequent shots of the same scene). Is there any ...
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OS X: How to perform a lossless crop of a JPEG image?
I'm looking for a simple way to losslessly crop JPEGs on Mac OS X.
Particularly, is there some way to get Preview to perform a lossless crop?
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Which is the best utility for opening .jpeg, .png and .tiff files on Linux? [closed]
Which is the most commonly used utility?
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How can I make Windows Paint save by default as JPEG format?
Every time I want to save an image I've pasted into the Paint application,
it chooses a BMP/DIB format (which is the worst for saving things from the clipboard).
How can I hack Paint into defaulting ...
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Is it safe to simply rename a .jfif file to .jpg?
I downloaded several images that are are .jfif files. I have various enhancements (e.g. context menus) and processing scripts that are keyed to *.jpg files and would like to use these with the new ...
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What's the difference between jpg and JPG on mac?
Why does the picture on top have 'jpg' capitalized, when they are all JPEG images? Is it because the file size is larger?
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Convert JPG to Video for playback in VLC
Is this a quick/simple way to convert a bunch of JPG stills into some sort of video file so it can be played back in VLC? If the convertion can be done using VLC, that would be preferred.
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How can I tell if a JPEG was saved as Progressive?
I received a set of photographs from a photographer and need to confirm that the JPEGs were not saved as Progressive JPEGs. I have Adobe Bridge and Photoshop -- how do I check this?
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Re-saving JPEG while keeping quality
Sometimes I use XnView's* "batch conversion" tool to downsize a bunch of JPEGs (to maximum of 1600x1200). But some of them are equal or smaller than that and no resizing is done.
Is any image quality ...
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Strange bytes added to end of JPG files on SD card
A month ago, my wife upgraded from a Galaxy S5 to S7, and brought along a MicroSD card full of photos taken on the old phone. Recently, in the process of backing up new photos, I noticed that a lot ...
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Recursively resize images from one directory tree to another?
I have a large complex directory tree full of JPG images. I would like to create a second directory tree that exactly mirrors the first, but resizing all the images down to a set size (say 2000x1500 ...
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How to extract lossless image from video with FFmpeg?
I have a 5s fps25 mp4 video and I use the following command to extract jpg images from the video
ffmpeg -i input.mp4 -r 1 -q:v 1 output_%01d.jpg
The images are extracted successfully, but jpg files ...
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Is there a way to find only progressive jpegs on Mac using Adobe CS or other apps?
To put my work up on my website, I initially collected some images and converted them to progressive jpegs. But later I went in and added more. I now can't tell simply by file size which ones are ...
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Print jpg's with file names
I have MS Office 2010, Windows Paint. Prefer to print multiple photos on a page with their filenames. Any suggestions?
I am using office computer so I cannot install any software.
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How can multiple image TIFF files be converted to JPEG files?
How can multiple image TIFF files be converted to JPEG files in a batch manner?
Update 1: convert on Linux (part of ImageMagick) as suggested by Miss Cellanie and glallen worked. It was ...
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How to generate an EXIF thumbnail for a JPEG?
I have a Canon Selphy printer and when trying to print images that have been edited on my computer a question mark appears in the viewer screen. It appears that the EXIF thumbnail in the image has ...
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How to convert PSD to JPG or PNG on Linux with Gimp CLI/batch mode (or other server-side tool)?
I've been working on a theoretically simple web service to convert PSD or AI files to jpeg, png or some web-compatible format.
I was able to successfully use ImageMagic's convert -flatten sample.ai ...
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How do I achieve lossless JPEG joining without truncation of partial MCUs?
I am working on a project for which I need to join thousands of JPEG images losslessly (I'm not talking about the Lossless JPEG/JPEG 2000/JPEG-LS formats here).
Aforementioned images have varying ...
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convert jpg images into a video
I have a bunch of jpg images i want to turn into a video, i have tried
JPGVideo but it did not work.
any recommendations?
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