Digital image file formats

What is a raw image format? and what exactly is a .JPG or .TIF file?

A raw image format file preserves the full range of data captured by a camera. A .JPG (or JPEG) is a ‘lossy’ file generated and exported from that full range of data (like a final print might have been traditionally printed from a piece of negative film). In some ways the raw file is the modern equivalent of the negative. It is highly malleable allowing fine detail to be teased-out and minor defects of exposure and colour temperature to be corrected. A .JPG file represents the final optimised output – it cannot be manipulated to the same degree and should be considered the last stage in the making of a photograph. It is highly desirable to capture (wherever possible) using the camera’s own native raw format.

Raw files can be endlessly manipulated, corrected, optimised and output to a ‘finished’ .JPG or .TIF file using software programs like Adobe Lightroom and Photoshop. Always keep and back-up the raw files – .JPG copies can always be recreated from an original raw file.

While a .TIF file preserves more data than a .JPG and will print well, it can be so large it is impractical to store or send as an attachment across the internet.

For more information on image file formats please see this article from Adobe [click here]

Raw formats are designated by an image’s file extension. Some proprietary camera raw formats are:

.NEF (Nikon cameras)
.CRW (Canon cameras)
.ARW (Sony cameras)
.RAF (Fujifilm cameras)
.RW2 (Panasonic cameras)
.DNG (Sony and Leica cameras)

.DNG – was originally developed by Adobe to be an open raw file format standard.

Apple computer’s ProRaw format is an adaptation of DNG
For more information on Apple ProRaw please see this article by Outdoor Photographer [click here]

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Competition - Conditions of entry

This contest is only open to fully paid-up members of Bollington Photographic group.

Images should be submitted with the theme/title as specified on our contest page and elsewhere on social media – all photographs to be taken in the local vicinity unless otherwise agreed with the organisers in advance. Images not complying with these conditions will be disqualified from the contest.

Submissions must be your own work and by entering the contest, you are agreeing that they may be subsequently used for promotional purposes by the group. Credits to the individual photographer will be given, and copyright of the image(s) remain(s) with the photographer.

Winning entries will be professionally printed for display in the exhibition and the winners agree to contribute to the production costs at £5 per image chosen by the voting process. 

Voting is only open to paid-up members of Bollington Photographic group and members of the Bollington Photographic Facebook Group. 

Voting will only be allowed following the closure of the submission period. No cheating, mind. You can only vote once for your TWELVE  favourites, – so make your votes count!

Please note: You WILL be disqualified if you vote for your own Photographs!

  • Image format should be JPG, either colour or mono and of a quality to allow printing up to A3 in size.
  • All submissions will be validated following the closure of the submission period and voting will then  commence. 
  • The voting period will be as specified on the contest pages. Votes outside these dates will be disqualified.
  • The twelve images with the most votes will be declared the winners and will be selected and printed for exhibition.
  • Winning entries will be announced within the website and on social media following the closure of the voting period and the winning photographers will be also be notified by e-mail.
  • The winners’ images will be posted on the groups’ Facebook Page and will be printed and displayed in the Turners’ Arms as part of the Bollington Photographic Group  exhibition. At the end of the exhibition period, the prints will be archived for future exhibition or returned to the photographer upon request.    The decision of the organisers will be final. E&OE