Entering photography contests on pxleyes is only possible by uploading a digital copy of your work through the "submit entry" button on the contest page.
Keep your pictures as close as possible to what got recorded when you released the shutter. Refer to the following paragraph to learn what kind of editing will be acceptable.
Only use your own pictures. You must be the original photographer of your entry. To prove your authorship, keep the original with exif data to allow for easy verification. You can use any type of camera, analog or digital, to create the original picture.
Photographing the work of others in a 'reproductive' way will not constitute a work of your own in the above sense. If you want to enter a picture of another artist's work, take an "interpretative" picture of that piece which holds its own photographic merit. In any case, credit the original artist in your entry properly.
What Tools/Alterations Can I use?
In general, you should try to avoid editing your photos, whether in camera or with some editing software on a computer. Being a good photographer also means being able to take good shots without having to edit afterwards. We understand that enhancing pictures after the fact has a long tradition in photography and thus we allow for certain digital darkroom techniques, which is readily available in most photo handling software today. As a general rule, you are allowed to all adjustments which act on the whole picture and on exactly one picture (a.k.a. non selective editing). This includes:
What Tools/Alterations Can't I use?
As a general rule, you should stay away from selecting, masking or brushing parts of the picture. Tools to avoid are:
Keep in mind that editing your photos should be kept minor. Too much editing can result in removal of your contest entry. This is a photography contest, not an image manipulation contest. In this sense, even "in camera editing" may be considered illegal by moderation.