Download an image from the internet. Make copies as GIF (Save them as GIF in Windows, you can use Paint or Draw). You must specific if the GIF you are working with is animated or not.

a) Described the header. Make a screenshot of the header

b) Find out which fields can be modified that will allow you to still open the image. Find out if there is anything that you could hide by changing the bitmap header information.

c) Provide as much information as you can about the header and the pixel information of gif (How is the data/pixel structure).