PART III : Generating Optimum Thumbnails
As you might be knowing “Thumbnails” are basically preview versions of Images. Width is usually between 100 to 500 pixels. But since the resolution is very small as compared to original Image the redundancies are also reduced and hence trying to remove Inter-Pixel redundancy using DCT i.e JPEG there will be a good amount of visible quality loss.
The Process is Basically Same as that shown in PART I & II but with different values for Image Quality and Image size.
- Steps 1 to 5 are exactly same as PART I.
- Step 6 : Same as that in PART I except set the “Image Quality” level to 90 or 95.
- Steps 7 & 8 are same as in PART II except you need to use a lower value for the width of the thumbnail say like 350 px.(Generally in between 100 ~ 500 Pixels wide).
- Steps 8 to 11 are same as shown in 2nd PART.
Results :
For Thumbnails of width 350 pixels the average was around 30~40KB and also maintaining a decent amount quality. The thumbnails are the same as shown in PART I and II.
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