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).
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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)
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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.