Questions
a) Explain the difference in the sizes of the two tiff files in steps 1) and 2)
In step 2 the tif file using the lzw compression minimizes the size of the image, therefore saving about 1/3 of the size.
b) When saving a jpeg file what two things change when you select a different quality factor?
The quality of the image becomes less detailed therefore resulting in blocking up of colours, loss of detail and creates unwanted artefacts.
c) What is 'dithering' and why is it used?
Dithering makes the bit size of an image smaller and creates an array of tones to minimize hard lines.
d) Explain the difference in size between the greyscale tiff file and the original tiff file.
The greyscale tiff file has less pixels than that of the original tiff file by only being 1/3 of the original file. The greyscale tiff file has only one colour channel.
