Newest 'jpeg+image-compression' Questions

0 votes

2 answers

630 views

Does JPEG compression reduce actual image size?

In this article it says "Generally speaking, the algorithm behind this format makes some trade-offs to lower the image size." Just wanted to check that this is referring to image file size, ...

ACrypticFish

23

asked Sep 26, 2022 at 14:09

1 vote

2 answers

183 views

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 ...

zli

307

asked Jan 26, 2021 at 9:42

1 vote

2 answers

354 views

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 ...

zli

307

asked Jan 26, 2021 at 9:33

0 votes

1 answer

713 views

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, ...

Elie

67

asked Jul 13, 2020 at 0:15

1 vote

0 answers

104 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 ...

Martin Perry

173

asked May 11, 2020 at 16:39

2 votes

2 answers

2k 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 ...

tracyguilbeau

21

asked Oct 27, 2019 at 2:22

1 vote

2 answers

370 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 ...

WilliamKF

1,715

asked Aug 17, 2019 at 20:42

34 votes

4 answers

8k views

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 ...

xiota

27.1k

asked Jun 27, 2018 at 11:25

2 votes

1 answer

108 views

regarding image transfer [closed]

I have this client that is having a very frustrating time. I took some pictures for their clothing line. I formatted them for social media posting and copied them to a USB. I gave her the USB and for ...

MAF

21

asked Apr 3, 2018 at 13:18

9 votes

4 answers

27k views

Is it not ideal to save image as PNG for printing?

So the scenario: I want to order a print of one of my images. It is a special image and will be relatively large (a couple of metres) so I want it to be perfect as possible. I have the RAW file, ...

adam

699

asked Mar 16, 2018 at 20:16

4 votes

2 answers

3k views

Why are JPEG images from camera huge and the same images exported from Vistaprint software 10 times smaller?

JPEG images from my Nikon D3300 are roughly 12-15MB big at 6000 x 4000resolution. RAW ...

SamuraiJack

153

asked Dec 11, 2017 at 11:34

1 vote

3 answers

2k views

Is it possible for jpg images of the same source have different file sizes but the same quality?

I have been using Google Photos as a way of backing up my photos. I noticed recently that they store two versions of any photo I upload, one with the original name of the file, say, ...

user321627

111

asked Oct 24, 2017 at 5:15

16 votes

3 answers

13k views

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 ...

PetaspeedBeaver

425

asked Mar 23, 2017 at 21:27

1 vote

1 answer

2k views

How to compress an image to a particular size in jpeg regardless of quality?

Scenario: I have an android app which captures images and sends over to a server. Till now I had been setting 50% quality. But with high end phones with better sensors and resolutions even with that ...

Sudip Bhandari

111

asked Dec 24, 2016 at 8:11

3 votes

3 answers

1k views

Quality of JPEG directly from RAW+JPEG versus JPEG embedded in RAW of RAW+JPEG?

When I use ImageMagick's identify command to look at the quality of the JPEG from my camera's RAW+JPEG mode, I see 95. When I use the same to look at the JPEG ...

user541686

646

asked May 27, 2016 at 3:24

0 votes

3 answers

1k views

How do I compress my TIFF files to JPEGs of a given size?

An online lab wants my large (over 100 MB) TIFF files as 50 MB JPEGs with a maximum of 80 megapixels for making aluminum 16x24 inch prints. What about final resolution? How do I convert from one to ...

john

1

asked Mar 1, 2016 at 18:42

1 vote

2 answers

687 views

Why doesn't PNG show more detail than JPEG in a converted NASA image?

I have a really limited knowledge of photography, so, bearing that in mind, here is my problem. I downloaded an IMG file with a separate label file from NASA PDS because I wanted to visualise the ...

Gaetano

11

asked Nov 24, 2015 at 11:50

6 votes

1 answer

2k views

Does writing EXIF tags influence jpeg quality?

If I understand well then the EXIF data is written in an extra space of the JPEG file. When I add or modify an EXIF tag does this leave the picture untouched? I searched for this and I was not able to ...

Marco

323

asked Sep 13, 2015 at 13:08

-1 votes

2 answers

639 views

Is there an easy way to export photos from Lightroom in original format if they're unedited?

When I export a folder or collection from Lightroom, I want unedited photos exported in their original format (like DNG, ARW, PNG) and edited photos exported in a chosen format, like JPEG. Is there ...

Kartick Vaddadi

4,726

asked Jul 26, 2015 at 12:40

15 votes

3 answers

7k views

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 ...

Christopher Bruns

253

asked Jul 17, 2015 at 13:20

3 votes

5 answers

944 views

Why do modern DSLRs support JPEG but not lossless formats other than RAW?

I'm from a programming background and very new to photography. While working with the SDK for the Canon Rebel T3i, I realized that the only image formats natively supported by the camera are RAW (CR2) ...

Raheel Khan

131

asked Apr 1, 2015 at 7:28

3 votes

4 answers

4k views

What is the best practice for batch compressing jpeg files?

This is fairly theoretical, as it is definitely in the realm of "pixel peeping" and is more or less irrelevant for practical use, but with the increasing popularity of full-width images on websites, I'...

Ryan

1,070

asked Feb 23, 2015 at 6:03

4 votes

3 answers

6k views

Best program to batch compress JPGs with minimal loss?

My photo catalog is getting bigger and bigger. It's mainly my fault because in my noob years I used to export all JPGs with a 100% quality, point at which files can reach the 10mb mark or even more. I ...

Andres

5,044

asked Dec 30, 2014 at 20:44

6 votes

2 answers

5k views

How does the usual jpeg 0-100 quality settings translate into Photoshop's 0-12 quality setting?

JPEG encoders usually use a quality setting of 0-100, whereas Adobe photo software uses a 0-12 setting. Does anyone know how to convert between these? (I am actually not clear on whether the 0-100 ...

John Robertson

553

asked Dec 3, 2014 at 18:48

26 votes

12 answers

45k views

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 ...

markthomas

1,193

asked Oct 30, 2014 at 14:09

2 votes

2 answers

784 views

Does a JPEG image uncompressed to bitmap prior to displaying it on the screen [closed]

Does a JPEG image converted back to bitmap image when displayed on the screen? Does it occupy more memory than the actual file-size when it is being displayed? Does JPEG images, if added to the web-...

VVK

131

asked Jul 3, 2014 at 10:09

8 votes

3 answers

3k views

Make photos on Facebook nicer?

I upload photos to my Facebook page using the latest Lightroom. I'm wondering if there are some tips or tricks, or maybe hidden options on Facebook that makes the images served to the viewers higher ...

Martijn Courteaux

346

asked Jun 5, 2014 at 11:32

3 votes

3 answers

9k views

Why does simply saving a JPEG at 100% quality in Photoshop increase filesize?

If I take a picture taken with my EOS 60D, put it into Photoshop, edit it as I wish and save it as JPEG with maximum quality, the file goes from 5 to 12 mb in size. Obviously if I didn't increase the ...

sharkyenergy

1,394

asked Jun 4, 2014 at 18:05

6 votes

4 answers

8k views

Why does Darktable export enormous JPEGs?

I have a Nikon D3200 and just started shooting in Raw. Raw files are 18-24mb, and if I convert them to JPEG using Nikon's ViewNX 2, I get 8-12mb files at the top quality and resolution using sRGB; ...

Matteo Pagliazzi

163

asked Jul 29, 2013 at 14:25

3 votes

3 answers

3k views

Does reducing Lightroom export file size reduce image quality?

Sometimes I reduced the file sizes of my jpeg images for faster uploading to the web. Does this reduce the image quality?

Petrick Lim

107

asked Apr 27, 2013 at 1:41

1 vote

2 answers

4k views

Saving as PDF with JPG compression vs saving it as JPG

I am creating a booklet with a hight resolutio (more than 4800 pixels height) and I am about to print it. My question is, what is better in terms of quality: Saving each page as a PDF with JPG ...

Steve

377

asked Apr 12, 2013 at 11:30

4 votes

4 answers

30k views

What image quality is lost when re-saving a JPEG image in MS Paint?

Has anyone ever noticed that if you open a image in mspaint (.jpg, .jpeg) and then just save it, the image size is reduced by many folds. I use this method to reduce the file size. However, I am not ...

Ankit

143

asked Feb 19, 2013 at 15:49

9 votes

3 answers

4k views

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 ...

Saaru Lindestøkke

8,763

asked Feb 1, 2013 at 17:44

54 votes

9 answers

226k views

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 ...

santiagozky

909

asked Dec 5, 2012 at 9:16

2 votes

2 answers

617 views

Good compromise on quality/compression for hi-rez photographs?

My Nikon D90 dumps out photographs that are 4288 x 2848 @ 300 DPI. They're about ~3 MB in size. I'm an amateur in every sense of the word. I don't know what 75% of the camera settings do. I'm ...

phtimsp1970

121

asked May 20, 2012 at 21:57

27 votes

6 answers

48k views

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 ...

mattdm

144k

asked Jan 16, 2012 at 16:28

17 votes

3 answers

10k views

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 ...

jaxxon

706

asked May 26, 2011 at 4:35

62 votes

1 answer

20k views

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

asked May 24, 2011 at 12:17

30 votes

5 answers

4k views

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?...

Mike Bryant

303

asked May 5, 2011 at 17:16

62 votes

7 answers

24k views

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 ...

Benjamin

653

asked May 5, 2011 at 11:03

20 votes

3 answers

11k views

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.

Andres

5,044

asked May 3, 2011 at 2:07

13 votes

4 answers

24k views

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 ...

Capsize

365

asked Nov 30, 2010 at 19:52

9 votes

2 answers

588 views

Is there a middle ground format between RAW and JPG?

JPG files use 8 bits per color per pixel (I've never heard of any camera that uses the alleged 12-bit-per-color-per-pixel extension) and is a compact way of storing images. RAW files are huge but ...

Jason S

761

asked Sep 13, 2010 at 23:16

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