At the moment the standard dimensions for the Club Projected Image Competition is 1920 x 1080 pixels.
 
Adobe Photoshop,
Open your image RAW, JPEG, etc in Photoshop. Need to convert to sRGB Colourspace.
Select Edit->Convert To Profile And ensure Destination is sRGB
To resize image Select Image > Image Size. Ensure pixels is selected.
As a general rule irrespective of if image is landscape or portrait orientated enter 1080 for the height Check that the width doesn’t exceed 1920.
If it does you need to instead set the width to 1920 or Adobe Lightroom.
To resize on Lightroom you do this at the time of Export Select image to Export then Select File->Export First locate the File Settings And select sRGB for Colour Space No locate the Image Sizing section Set size to 1080 Pixels Now you need to set the edge.
If the image is Landscape you select Short Edge and if Portrait Long Edge