Advantage of DNG is that it is open source file format and guarantee that you will be able to use your files in feature regardless of changes on market. Every company which is producing digital cameras have its own raw format which is not publicly available. What if company fail in feature? Files converted to DNG are protected and you will be able to use them with Adobe products but also with any other image editing software because it is easy for producer to support DNG since it is open source.
Digital negative is the same with RAW image format. See the related question for more details about this format and a comparison with other formats.
it must be in digital file format. see related link for all supported files.
Adobe illustrator (AI) is a vector file format to save vector illustrations. It is the default format for Adobe illustrator. Photoshop cannot save the images in to AI format but it can be opened in Photoshop.
almost any format:.jpg , .gif , .png are most common but you can open almost any other format
In Photoshop - PSD file format.
Recommended format is .psd format which preserve almost all Photoshop capabilities.
Portable Document Format. It's like an un-modifiable text document. Photoshop can output to it.
Beside PSE You can open any other format that Photoshop Elements have to offer to save image.
When a photoshop file is too large (in bytes) to save as a regular .psd, it will be saved as a Photoshop Large Document Format or a .psb file.
digital camera
Photoshop layers may not import into After Effects if the file format is not compatible or if the layers are not properly organized in Photoshop. Make sure to save the Photoshop file in a format that After Effects supports, such as PSD or TIFF, and ensure that the layers are named and organized correctly for easy import.
psp is used by photoshop.