After reviewing both methods ('nearest neighbour' and 'bilinear interpolation approximation'), I found it difficult to compare my 2 pictures because picture1 was very dark to begin with and picture2 had a fairly uniform blue colour. The spectrum was very colourful therefore, based on the images I did produce it was clear to me that 'bilinear interpolation approximation' method was much better. It had better constract and it seems to show a better and smoother transition between the colours. The colours seemed to flow much better as evident in the spectrum image especially.
According to Chapter 2 in the text, p. 67, although, bilinear interpolation gives a more favourable image when compared to the original. Programs such as GIMP and Photoshop must work in bicubic interpolation which yields a higher contrast and smoother colour transition than bilinear interpolation when compared to the original image.
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