Assignment 1

Introduction to Information Technology - Assignment 1
Sunday, 12 June 2011
8:50 PM
Image
Report
Original
Resolution / Pixel Dimensions: 388 x 648
Bit Depth: RGB 24bit
File Size: 37KB
File type: JPEG
This is the original image of a young boy taken with a digital camera (iPhone 4 camera - 5 megapixel)
Greyscale
Resolution / Pixel Dimensions: 388 x 648
Bit Depth: Greyscale 8bit
File Size: 61KB
File type: JPEG
In this image I changed the colour mode of the image from RGB to Grayscale. In doing this, I have
reduced the bit depth of the image from 24 bit (256 possible colours per colour channel) to 8 bit (256
colours for a single colour channel).

Assignment 1 Page 1

---

Negative
Resolution / Pixel Dimensions: 388 x 648
Bit Depth: RGB 24 bit
File Size: 76KB
File type: JPEG
In this image I selected the invert option - which changed the brightness value of each pixel to the
inverse value on the 256 colour value scale.
Thumbnail:
Resolution / Pixel Dimensions: 120 x 200
Bit Depth: RGB 24bit
File Size: 26KB
File type: JPEG
In this image I changed the pixel dimensions of the image from 388 x 648 to 120 x 200. When doing
this I selected the option to resample the image with the Bicubic sharper interpolation method which
reduces the size of the image whilst still retaining the sharpness of the image.
Artistic - Poster Edges (Photoshop)

Assignment 1 Page 2

---

Artistic - Poster Edges (Photoshop)
Resolution / Pixel Dimensions: 388 x 648
Bit Depth: RGB 24bit
File Size: 194 KB
File type: JPEG
The poster edge tool reduces the number of colours in the image using posterisation - a technique
which will convert a continuous tone into several regions of fewer tones. I set the maximum
posturisation which resulted in an almost black and white looking image. This tool also draws black
lines around the edges in the image giving it a cartoonish appearance.
1. Issue 1: Which task did you find the most difficult? Why? Would it 3 marks for describing their diffculties
have been more difficult to smudge (i.e. make obscure) a certain
part of the image (such as obscuring an individual's face, or
Creating the thumbnail as I needed to reduce the resolution of the image without impacting on the
removing a corporate logo)? Why or why not?
image quality, when reducing the pixel resolution the image will often appear blurry. This task
involved a lot of trial and error in selecting the method to resample the image.
2 marks for the smudge issue.
Blurring the image / smudge tool picks up colour from surrounding pixels and drags it through the
destination pixel. This would not be more difficult than creating a thumbnail, but you should be
careful as you can't change the pixels back to their original colours.
Would it have been more difficult to smudge ... THEN WHAT ?
2. Issue 2: At the pixel level what would be needed to be done to
3 marks for a discussion of how to select the colours
change the colour of an object (such as a hat, or to change Thomas's
blue colour to James's red)?
You would first need to select the pixels that make up the area you are changing. At the pixel level
the binary sequence of the colour would have to change from one set of values to another . In the
HSB mode you would need to change the value of Hue and keep the brightness and saturation the
same.
2 marks for a discussion of how to select which pixels are to be changed.

Assignment 1 Page 3

---