At the moment the standard dimensions for the Club Projected Image Competition is 1920 x 1080 pixels.
Anything larger / smaller than these dimensions will be automatically resized and quality may suffer because of it.
for 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.
Change the resolution from the default (usually 240) to 72.
Ensure constrained proportions is enabled
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