All the information on the the other FAQs tells me not to save in JPEG, and not to convert my colour data to sRGB.
But to submit projected images for competitions, I have to convert to sRGB and save as JPEG. What gives?
The projector that the club uses works with the WUXGA video standard. Newer (expensive) projectors can do better, but our projector can project only 1920 pixels across and 1200 pixels high. Also, its colour gamut (the range of colours it can display) is limited to the gamut of sRGB. Therefore, to display the images they need to be resized and converted to sRGB.
Because the images are emailed, they need to be relatively small in size, so the compressed JPEG format is a useful way to to send them.
But if you are planning on making images for our ProjIm competitions, make those changes only after you have saved a copy of your finished master file (RAW or TIFF, maximum size, and encoded in AdobeRGB or ProPhotoRGB).
Keep your master in as high quality as you can, so that if you ever want to have it printed or enlarged, that will be possible.
Once the image has been resized, converted to sRGB, and saved as JPEG too much information will have been thrown away, and the chances of making a good print will be minimal.
Generally, if you are outputting an image file for the web, the club’s ProjIm standard is a good format to use. Most people’s monitors are capable of only displaying sRGB colours; and web files should be small so they download fast, so JPEG (compressed to around 72% quality) is a reasonable choice. Also, while many people, especially photographers, now have monitors capable of displaying 3840 x 2160 or more pixels, i.e. much bigger than 1920 X 1200, very many people still have even less than 1920×1200 capability. If you send a bigger file to them, their computer’s video card will resize the image anyway and might ruin it. You might as well resize to 1920×1200 yourself and retain as much control over quality as possible.
However, don’t do any of that on your original file.
Again: Save your master file with the maximum number of pixels (TIFF or RAW, not JPEG) and with the maximum colour information (AdobeRGB or ProPhotoRGB, not sRGB) so that if you ever want to have it printed or enlarged, or if higher quality monitors and projectors become common, you will have all the data you need for a high quality image.