Tuesday, October 2, 2018

What Is The Differences Between Image File Formats


After you’ve captured great photos of properties, lawns, interiors, and more, you are most likely going to save those images so you can upload them to your website or print them for your portfolio. Do you save them in TIFF, JPEG, PNG, DNG or some other file format?

Lossy vs. Lossless


Before discussing  the image file types that photographers commonly use, it is important to know the concept of lossy and lossless file compression. A lossy algorithm removes some information in the digital file to reduce the file size. However, the loss of information lowers the overall quality of the image. Lossy files can be saved in your computer at various quality levels.

On the other hand, a lossless algorithm retains all the information in the image. But that also means lossless files takes a lot of space in your storage device.

Raster vs. Vector


When you think “image format,” you’re probably thinking of a raster. It has nothing to do with Bob Marley – it just means that the file is essentially a grid of colored pixels that make a picture. JPG, PNG, GIF, TIFF, and most other photo files are rasters. The only information they have is what color the pixels are, so enlarging or stretching them will generally just result in a more pixelated image.
 
Vectors, though, are designed to be scaled forever. SWF, EPS, and PDF files store images not as pixels, but as math equations that can be rendered as points and lines. The image can get as big or as small as you need without taking a quality hit, but these extensions are not as common around the Web since vectors are not as readily compatible as raster images.

Joint Photographic Experts Group (JPEG) – Lossy Raster


The JPEG file is named after the group that created it and dominates the world of web images due to its near-universal compatibility and small size. Your eye probably couldn’t tell a lightly-compressed JPEG from a higher-quality image without a few seconds of scrutiny, and it loads fast, so it’s good enough for most of the Web.
JPEG-2000 is the updated version that has some improvements over the original, but it’s never really taken off, so you’re unlikely to see this format many places.

Great for: putting photos on the Web, saving and sending small image sizes, general use, printing out pictures.

Portable Network Graphics (PNG) – Lossless Raster


This format has become the go-to for high-quality web graphics, especially if you need a transparent background. PNG was originally designed as a GIF alternative, but it supports way more colors and is more flexible about transparency settings. The file size is generally bigger than either GIF or JPEG, but PNG preserves quality better and is more flexible,

You may also run across PNG-8 and PNG-24 in some programs. These will still export as normal PNGs, but PNG-8 only supports 256 colors and doesn’t allow partial transparency, netting you a smaller file size than the more full-featured PNG-24.

Great for: web graphics, high-quality photos where size isn’t an issue, transparency.

Graphical Interchange Format (GIF) – Lossless Raster

The predecessor to PNG, the GIF format is now most famous for enabling the short video loops that you can’t stop watching on social media. The debate over whether to pronounce it as “gif” or “jif” is fairly heated, but if you want to make both sides angry, try pronouncing it as “jeff.”

GIFs only support 256 colors, which makes them a poor choice for high-quality photos, but their compression is excellent, so it can downsize simple images without a huge quality hit. Pixels can also be made transparent, but must be either on or off, not in-between.

Great for: simple graphics, animations, icons.

Tagged Image File Format (TIFF) – Lossless Raster


You may not have run into a TIFF personally, but if you’re into photography or work much with print media, you may recognize them as the large, but high-quality, format often favored by publishers.  Also, no one argues about the pronunciation.

Great for: printing high-quality photos, scanning high-quality images, anything where size isn’t an issue.

Scalable Vector Graphics (SVG) – Vector


If you’ve ever tried to save an image off the Internet and instead gotten the “save as a webpage” option, you may have seen an SVG. These are possibly the most widely-supported vector graphics out there, and their ability to maintain good quality and scalability at low file sizes makes them popular for logos, site graphics, and anywhere else that a vector would come in handy.
 
Great for: business graphics, scalable graphics, logos.

New Image File Formats

You may not have seen these formats in the wild yet, but they offer some advantages over today’s standards.

High Efficiency Image Format


HEIF is essentially JPEG but with higher quality and smaller file sizes. This is now the default picture format on iOS 11 and later.

WebP

WebP is Google’s format, and it does pretty much everything: better compression than JPEG, better animations than GIF, and transparency on par with PNG. It’s supported by several browsers and is currently being used by YouTube, Facebook, and a few other sites if you visit them using a supported browser.

Why So Many Formats?

It’s unlikely that there will ever be one format to rule them all, since different fields have different image needs. General internet browsers don’t really need to think beyond JPEG and PNG (and maybe WebP and HEIC in the future), but for business and publishing applications, having options like TIFF and SVG makes life easier.

And, if you haven’t already, you should think about choosing a side in the GIF debate before the format disappears. Be part of history.


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