File Format Research

Compression:

JPEG

This is use to compress digital images, the amount of compression you use can be changed depending on how much you want.

RAW

RAW is a lossless format, meaning that information is not lost during the process, but this file format is bigger to save.

TIFF

 TIFF files may be edited and re-saved without losing image quality due to it using lossless compression.

PSD

stores an image with support for most imaging options available in Photoshop. These include layers with masks, transparency, text, alpha channels and spot colours, clipping paths, and duo-tone settings.

Lossy, Lossless, LSW Compression:

Lossy Compression

 This is a form data compression in which some amount of data is lost.

Lossless Compression

This is a form of data compression in which the data can be reconstructed.

LSW Compression

This compression type is lossless meaning you will not lose quality of the file when you compress it.

What happens when the file is repeatedly edited and saved and compressed to JPEG?

When this happens the original image cannot be restored so this would of used a lossy compression as parts of the data would of been lost in the saving process.

What does 8-bit, 24-bit and 48-bit mean when referring to digital files?

8-bit

This is a method of storing image information in a computer's memory or in an image file, such that each pixel is represented by one 8-bit byte.

24-bit

This provides a method for representing and storing graphical image information in a RGB colour space.

48-bit

 2 to the power of 48 (281,474,976,710,656 colours) this file format involves very deep colouring.

Which file types support photoshop layers?

A PSD file would be able to support photoshop layers 

Which file types support non-destructive cropping?

PSD and RAW would be able to support  non-destructive cropping

Which file types support clipping paths?

A JPG file would be able to do this.

What are the benefits of digital negatives?

They have a wider dynamic range and better colours

They preserve most of the information of the captured image

They also give you better detail in your image and make it easier to edit.