A3 - Image Types and Formats

Image Types

Binary Image

FileSize: 5135
Format: GIF
Width: 362
Height: 362
Depth: 8


StorageType: indexed
NumberOfColors: 256
ResolutionUnit: centimeter
XResolution: 72.000000
YResolution: 72.000000






Grayscale Image


FileSize: 77088
Format: JPEG
Width: 450
Height: 300
Depth: 8
StorageType: truecolor
NumberOfColors: 0
ResolutionUnit: inch
XResolution: 180.000000
YResolution: 180.000000

Truecolor Image

FileSize: 79400
Format: JPEG
Width: 563
Height: 422
Depth: 8
StorageType: truecolor
NumberOfColors: 0
ResolutionUnit: inch
XResolution: 72.000000
YResolution: 72.000000

Indexed Image


FileSize: 17324
Format: GIF
Width: 1024
Height: 768
Depth: 8
StorageType: indexed
NumberOfColors: 256
ResolutionUnit: centimeter
XResolution: 72.000000
YResolution: 72.000000

High Dynamic Range Image

FileSize: 588218
Format: JPEG
Width: 2048
Height: 1365
Depth: 8
StorageType: truecolor
NumberOfColors: 0
ResolutionUnit: inch
XResolution: 1.000000
YResolution: 1.000000

Multispectral Image

FileSize: 328466
Format: JPEG
Width: 1002
Height: 1002
Depth: 8
StorageType: truecolor
NumberOfColors: 0
ResolutionUnit: inch
XResolution: 72.000000
YResolution: 72.000000







3D Image (Stereopairs)

FileSize: 27220
Format: JPEG
Width: 448
Height: 336
Depth: 8
StorageType: truecolor
NumberOfColors: 0
ResolutionUnit: centimeter
XResolution: 72.000000
YResolution: 72.000000

Image Formats

TIFF or Tagged Image File Format is a lossless storage format for storing high quality digital images with the benefit of not incurring cumulative error when repeatedly editing and storing images. Its disadvantage is that it is not universally compatible, especially for web browsers, and the image size is much larger than other images compressed in different file formats.

JPG from Joint Photographic Experts Group is a universally compatible lossy storage format which can provide large compression of images with minimal loss in the quality perceived by our eyes. It is a good end format for transmission and archiving.

GIF or Graphics Exchange Format is limited to 256 colors and is generally "lossless" in storing images with colors less than this number, with large areas of the same color.

PNG or Portable Network Graphics stores images as indexed images like GIF, but is capable of storing 16 million colors giving it the capacity to store truecolor images. It is ideal for storing images with areas of uniform color and for displaying "lossless" images on the web.

BMP or Windows Bitmap is an uncompressed file format that handles graphics files for the Microsoft Windows OS.

RAW files are the original files stored in the digital camera that are not often compatible with other image editing or viewing software and are manufacturer dependent.

Other proprietary file formats of different image editing software like Photoshop or GIMP are ideal for storing works in progress but the final product is best to be saved as JPG or TIFF depending on the application.

Thresholding

The first figure at the left is the original image I used in Digital Scanning. The middle image is its histogram. Based on the histogram, I obtained the last figure by turning it to black and white with a threshold of 0.45. We can notice that in the third image, the grainy structures along the graph have disappeared.

For this activity, I would give myself a grade of 10 because though I posted it late, I still did my best. This activity also taught me a lot about the appropriate file formats to use for saving different images.