Competition Guidelines – Digital Images

Link to details of
internal competitions
external competitions

Digital Images

All digital images for projection must be saved as JPEGs, sized to within a maximum of 1600 pixels in width by a maximum of 1200 pixels in height. A standard 3:2 image in horizontal orientation should therefore be 1600×1200 but a 3:2 image in vertical orientation should be 800×1200. A square image should be 1200×1200.

Movies: Digital audio-visual presentations must be saved in either MP4 or MOV (Quicktime) file formats; maximum quality should be FullHD (1080p25).

Files must be named as follows:
– Priority level (outlined in the general guidelines)
– underscore
– Your membership number, as a two digit number (7 becomes 07, but 13 remains 13)
– underscore
– Image title

For example:
A_07_Photophrolics.jpg
B_13_Phrantic Photons.jpg

Copy the files to a blank memory stick and hand it to the competition secretary on or by the specified hand-in date (normally 3 weeks before the competition). It is a good idea to write your name or initials on the stick.

Alternatively, email your images to the competition secretary on or by the hand-in date – email int-comps@perthshirephotographicsociety.org.uk.

For the Simpson Cup AV competition, files are likely to be too large to email, and can be sent to the above address via wetransfer.com or similar ftp service.
(For the 4-Way, email ext-comps@perthshirephotographicsociety.org.uk)

Resizing Digital Images in Photoshop and Elements

First, ensure the “Constrain Proportions” box is checked. This way, whatever happens with the image size, it will retain the same aspect-ratio.
For a landscape orientation image, type 1600 into the width and the height will follow suit.
For a portrait orientation image, type 1200 into the height and the width will follow suit.
It is probably best to use “Bicubic Sharper” for resampling (but feel free to experiment).
More help can be found in the SPF guidance.
In Lightroom simply select Width and Height in the Export dialog and enter width 1600 and height 1200 pixels. This works for all aspect ratios. Quality 80 is fine.

Some notes on resolution (DPI)

This is not important for digital submissions because the SPF rules stipulate a number of pixels.

For those who are interested, pixels per inch (ppi) only becomes relevant when you have both pixels (px) and inches (in); that is, you are printing or displaying on a medium of a particular physical size.

The relationship between the numbers is

  • ppi = width(px) / width(in)

or equivalently

  • width(in) = width(px) / ppi

When holding an A4 print at arm’s length, the human eye is capable of resolving about 300ppi.
For example: a 6000 x 4000px (24-megapixel) image may be printed at 20 x 13.33 in at 300pppi.