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A file format is a particular way that information is encoded for storage in a computer file.

learn more… | top users | synonyms

75
votes
5answers
2k views

What is RAW, technically?

From a technical perspective, what exactly is RAW and how does it differ from JPG or bitmap images? I'm not asking about the pros/cons versus another format, but rather what constitutes RAW format, ...
49
votes
7answers
9k 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 ...
26
votes
5answers
3k 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 ...
25
votes
4answers
3k views

Do I lose anything converting to DNG?

I'd like to convert all my ARW (Sony) files to DNG for several reasons, but the only thing keeping me back from doing it is the fear of losing useful metadata during the conversion. I know that the ...
25
votes
8answers
3k views

Which is a better way to store your photos? RAW or TIFF?

I have read posts that alot of photographers are using RAW to store photos. But the problem I am having is that how do you people view the photos easily when you need them? In the beginning I have ...
24
votes
6answers
3k views

Which cameras support DNG natively?

Not all cameras support DNG natively. That is, if you want to process DNG files they need to be converted from the camera's proprietary RAW format to DNG afterwards. So, which cameras support DNG ...
23
votes
7answers
9k views

Is it better to store edited photos as PSD or TIFF files?

After editing/retouching a photo in Photoshop, if I want to store that file long term with the edits, what are the advantages/disadvantages of storing it in TIFF vs. PSD format? There's a ...
22
votes
12answers
1k views

How do I make sure my RAW files are readable in the future?

I've recently started to use RAW with Lightroom. I'd like opinions on how I should make sure my images are readable (not necessarily editable) a few years hence. Heck, let's say a decade some decades. ...
17
votes
6answers
11k 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 ...
16
votes
8answers
4k views

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 ...
14
votes
6answers
7k views

What, if anything, does “RAW” stand for?

I understand that RAW files contain data straight from the sensor, that they're used as input to the production process that results in a final image, and that RAW isn't really one format but a ...
13
votes
3answers
9k views

Is TIFF really of higher quality than PNG-24?

I've been doing some research to try to figure out why more people do not store high-resolution image files as PNG-24. PNG has exactly-reversible, lossless compression, it is a net-friendly format so ...
13
votes
6answers
18k 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 ...
13
votes
5answers
72k views

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 ...
11
votes
2answers
2k views

Does the Canon *.CR2/CRW format contain “truly RAW” data?

In my work I am dealing with *.CR2 raw images taken by a Canon DSLR in raw mode. When I read about the format here, I was surprised to find that it has 4 TIFF IFDs which contain a) Original Size JPEG ...
9
votes
3answers
808 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 ...
7
votes
6answers
2k views

Why isn't saving photos as TIFF files a popular choice by DSLR manufacturers?

Why do many DSLRs have the option to save in RAW or JPEG but not in TIFF? It would be useful to save it as a TIFF file using lossless compression. It would be a midway between RAW and JPEG. Is it ...
7
votes
8answers
88k views

How to reduce the file size of my photos (to under 15 MB)?

I don't have a "Pro" account on Flickr, just the free one, so my photo uploads are capped to 15 megabytes/file. After post-processing, my photos end up being too large to be uploaded to Flickr. I do ...
7
votes
4answers
1k views

What is a reasonable file format for film scanning?

I'm looking to use my CanoScan 8600F to digitally archive the photos I've shot on film. The issue I've stumbled on is deciding on a file format. Ideally I'd like something that is lossless but with ...
7
votes
1answer
643 views

How many different RAW formats are there?

All major manufacturers seem to have their own raw file format. How many of them are? Do they all have similar information? Is there any standard?
7
votes
2answers
1k views

Should I care about jpeg2000 (and does anyone else)?

I know the question is a bit subjective, what I'm after is if there is enough improvement in jpeg2000 and enough support in software (image viewers, browsers) to warrant using it.
6
votes
4answers
4k views

Should I save an image as png, jpeg or bmp?

If I edit an image file using some application like Gimp, Photoshop or MSPaint, while saving I will be asked to select the required file-format. There are different formats available, the common ones ...
6
votes
3answers
299 views

Is there an open format to share image editing information?

I'm trying to find what would be the easiest way to share editing information across application while keeping the original image. My needs are pretty basic: I do keywording, toning and white ...
5
votes
3answers
1k views

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 ...
4
votes
3answers
4k views

How can I resize Raw images and store them back in the original format?

I have some raw images captured using Canon,Nikon,Minolta cameras.(*.CR2, *.NEF, *.MRW) I want to change resize them and store them back as the original format. I checked in two tools, Canon ...
4
votes
3answers
213 views

Which has a faster write time: RAW or JPEG?

My question is about the write times of the RAW and JPEG file formats. A RAW file is larger than a JPEG and needs more time to write to the memory but it does not need to spend time on data ...
4
votes
1answer
2k views

What is lost when RAW is exported to TIFF for editing?

Is anything lost when you export from (Canon) RAW files to TIFF? For context: I backup and archive my RAW files, and keep a separate (Aperture) library for exported JPEGs. So far my workflow has been ...
4
votes
3answers
8k views

What's the difference between PEF and DNG RAW formats?

I just recently purchased a Pentax K-r. It has two formats to shoot raw with, PEF and DNG. Are there advantages or disadvantages with using one over the other?
3
votes
4answers
2k views

How can I convert a proprietary raw image format to Adobe DNG?

I have a proprietary raw camera image format taken from a Aptina camera. Its raw file format is 16bit per color channel, 'GRBG' mode with file extension .raw. No headers, nothing, just plan raw bayer ...
3
votes
4answers
3k views

Did the Canon Raw format change in 70D?

Have there been any change in Canon's RAW (CR2) format in the Canon EOS 70D camera, comparing to older models like the EOS 60D? I could not open the 70D RAW files in Photoshop on a friend's computer, ...
3
votes
2answers
3k views

What information is contained in “filename.jpg.out.pp3” file?

When I edit my RAW file in RawTherapee and save it as JPG, the application creates another companion file along with the JPG — a file with the extension .jpg.out.pp3. What is the purpose of this ...
3
votes
1answer
302 views

What are the files *.DSC, *.CFG and *.XMP and their purposes?

I am using a Sony Alpha-100 DSLR camera (and don't use the Sony software). The files, both RAW (*.ARW for Sony) and *.JPG, have a DSC (Digital Still Camera) prefix then a number. The photos are in a ...
2
votes
4answers
299 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) ...
2
votes
4answers
5k views

Difference between PNG and RAW, other than compression?

I know that many professional cameras shoot in RAW. PNG has lossless compression which would allow cameras to save more shots than RAW. This leads me to wonder if there's anything special about RAW ...
2
votes
3answers
718 views

Is it better to print from jpg or tiff on A2 paper?

I just read the answers here, but if we are talking about printing high quality in A2 format (that's about 16"x23", for those not used to ISO standard paper sizes) on a good printer, is it possible to ...
1
vote
4answers
2k views

Why does the RAW file format take up so much more space than JPEG?

When I have it set to the highest JPG quality, my 8GB card can hold about 1000 images. If I switch to RAW format, it drops the capacity to about 200 images. So why do images captured as RAW take up 5 ...
1
vote
2answers
89 views

Is it a good way store photo sets in a djvu file?

I have many set photos and i need organize them in packages, albums, something like that. I was storing them in a zip or cbz file, but djvu files seems best. What do you think about?
1
vote
3answers
476 views

What is the difference between the different ways to export JPEG files from Photoshop?

Photoshop allows you to save the processed image as JPEG in two ways. Save As and Save for web. I have observed that Save for web gives more options like converting to sRGB etc. I have also observed ...
1
vote
2answers
99 views

Why are the extensions of files imported to my Mac in upper case?

I have an Olympus Stylus 1 camera. When importing photos taken with that camera onto my iMac via finder (not the Photos or iPhoto app) the extension of the photos are always in upper case, for example ...
1
vote
4answers
84 views

Will a TIFF or JPEG be a better choice for detailed representation of an old painting?

I wish to purchase a high resolution photograph of an old painting to project and copy. The images are either in TIFF format, which is 148.8 mb, or JPEG, 24.3 mb. Would either of these give me the ...
1
vote
3answers
103 views

Should I save scanned images of 35mm slides from a Nikon scanner in JPEG or Tiff?

I am scanning 35mm color slides, some 50 years old, with a Nikon scanner. Should I save the scanned image in jpeg or tiff format for saving on archival CDs?
1
vote
1answer
274 views

Nikon D600 - shot raw but ended up with 2x JPG

I have been using a Nikon D600, and I thought I was using the raw mode (it said RAW on the screen). However after copying from the card to my computer, I have only managed to get a set of paired jpegs ...
1
vote
2answers
136 views

How to open 'RAW' file from UltraCam-Xp WA camera?

Is there any software which opens Digital Camera 'RAW' file format (size- 47 mb)? I tried Photoshop cs2 but it shows stretched pixels. I tried to import it in Erdas, it also shows error that ...
1
vote
0answers
144 views

What is the practical purpose of “use raw as original” in Photos for OS X?

Within OS X Photos app, when I shoot jpeg/raw and upload to Photos, I get an image representing both files. By default I am looking at the jpeg. Or I can choose a command "Use Raw as Original". I ...
0
votes
3answers
162 views

How can I prevent someone from zooming in to a photograph I send them? [closed]

I have a photograph named A.jpg. I have to send it to some other person and I dont want him to zoom it more than 30%. Is there any such option? I am ready to change my extension of the photograph ...
0
votes
4answers
1k views

Does converting RAW files to TIFF lose image quality?

Before I found out about Camera Raw, I used to convert my photos from RAW to TIFF, using the XNVIEW convertor, downloaded from the Internet. My question is whether I lost image quality or anything ...
0
votes
2answers
213 views

How do I convert a single FITS image into Red, Green and Blue images? [closed]

I've been looking for a software to get a FITS file and export 1 file for each of the RED, GREEN and BLUE channels. I came across Nebulosity last week, but I can't buy it's licence since I live in ...
0
votes
3answers
648 views

How can I work around Photoshop Elements 7's inability to open JPG files from my Android phone?

I copied some photographs that I took with my Android phone to my laptop. When I tried to open them with Photoshop Elements 7.0, I received the following error message: Could not complete your ...
0
votes
1answer
191 views

Organizing photos for archival purposes, what format for metadata?

For long term archiving, what metadata format(s) are most likely to be readable in 10, 20, or 30 years? Currently I archive photos by directory in a tree structure starting with year at the top level. ...
0
votes
1answer
381 views

What are compressed image formats with high quality/size ratio?

I'm looking for an image format, unpopular as it may be, that has good quality and also good compression. After I'm done post-processing my RAWs I want to export them in a way that's shareable and ...