"Post-shot Adjustments may be made to your image in a photo editing program, so long as the modification is applied to the whole image. This includes levels, conversion to black and white, hue/saturation, sizing/rotating, curves and cropping (or their non-Photoshop equivalents)."
Some more.. to bring home the point of what constitutes editing vs. 'manipulation';
"Filters: The use of filters (or non-Photoshop equivalent) is strictly limited. Any filter or stand-alone utility designed and used to preserve the integrity of the image and/or reduce the effects of noise, scratches, etc, are permitted. These include but are not limited to the Sharpen, Unsharp Mask, and Dust & Scratches filters, and standalone image cleanup utilities such as NeatImage. However, no effects filters may be applied to your image, with the exception of Noise and Gaussian Blur, which are allowed. Any filter permitted by this rule must be applied uniformly to the entire image. Selective application of any filter is prohibited."
"Layers: Only Adjustment Layers (or the non-Photoshop equivalent) may be used. An Adjustment Layer is one that does not contain any pixel data, but rather is a special, non-image layer that lets you experiment with color and tonal adjustments to an image without permanently modifying the pixels."
Image Modification and Content Rules
"Post-shot Adjustments may be made to your image in a photo editing program, so long as the modification is applied to the whole image. This includes levels, conversion to black and white, hue/saturation, sizing/rotating, curves and cropping (or their non-Photoshop equivalents)."
Some more.. to bring home the point of what constitutes editing vs. 'manipulation';
"Filters: The use of filters (or non-Photoshop equivalent) is strictly limited. Any filter or stand-alone utility designed and used to preserve the integrity of the image and/or reduce the effects of noise, scratches, etc, are permitted. These include but are not limited to the Sharpen, Unsharp Mask, and Dust & Scratches filters, and standalone image cleanup utilities such as NeatImage. However, no effects filters may be applied to your image, with the exception of Noise and Gaussian Blur, which are allowed. Any filter permitted by this rule must be applied uniformly to the entire image. Selective application of any filter is prohibited."
"Layers: Only Adjustment Layers (or the non-Photoshop equivalent) may be used. An Adjustment Layer is one that does not contain any pixel data, but rather is a special, non-image layer that lets you experiment with color and tonal adjustments to an image without permanently modifying the pixels."