There is no simple answer, the answer depends on the image contents and on the number of unique colors in the image.
For photos jpeg is the best option, compression is lossy, but for the human eye the differences are not that dramatic. You can adjust the compression level (some tools allow it, some not).
For small images, with a maximum of 256 colors .gif or .png are good. Both use loss-less compression.
You can use an image converter to test some of the possibilities (gif, png or jpeg).
By reducing the size if a image
the screen format
the .mpg format or the cam-rip
GIF for images that contain 255 colours or less. Else JPG/PNG.
GIFs are small but poor quality.
Full form of GIF format of image is Graphics Interchange Format. This format of image can able to save only 256 colors which makes this format poor in the comparison of other image format.
Pixel Pitch is the measurement of the smallest bit of data in a video image. The smaller the size of the pixels in an image, the greater the resolution.
BMP or PNG of size smaller than 240X320.
a pixel is the smallest element in an electronic image
There is no answer to that until you specify the format. Even so if its format includes any compression (jpeg for example) there is no way to get the image size out of the final size since the compression rate depends on image content.You can guess, that is all. I would guess your are taking about a jpeg from a 12MP camera, still this is nothing but an educated guess.
TIFF stands for Tagged Image File Format :)
i think it not supports any image format...