Image no. 1:
Image Preferences:
Image resolution: 600x800
File size: 306 KB
Colors: 16 Millions
Graph:
Compressing:
- With Dithering
I compressed the image and reduced number of colors from 16 million to only 64 and it still looks very nice. The file size is three times lower than the original file.
Image Preferences:
Image resolution: 600x800
File size: 107 KB
Colors: 64
- Without Dithering
I compressed the image and reduced number of colors from 16 million to 64 and it still looks nice too but we can discover that there are missing colors. The image file is bigger than the image with dithering because more colors are used.
Image Preferences:
Image resolution: 600x800
File size: 148 KB
Colors: 128
Image no. 2:
Image Preferences:
Image resolution: 600x800
File size: 479 KB
Colors: 16 Millions
Graph:
Compressing:
- With Dithering
I compressed the image and reduced number of colors from 16 million to only 64 and it still looks very nice. The file is more than three times smaller than the original file. Image has small dots in some places.
Image Preferences:
Image resolution: 600x800
File size: 174 KB
Colors: 64
- Without Dithering
I compressed the image and reduced number of colors from 16 million to 128 and it still looks nice but we can discover that there are missing colors on the sky. Probably sky has a lot of different shades of blue. The image file is bigger than the image with dithering because more colors are used.
Image Preferences:
Image resolution: 600x800
File size: 192 KB
Colors: 128
Image no. 3:
Image Preferences:
Image resolution: 600x800
File size: 385 KB
Colors: 16 Millions
Graph:
Compressing:
- With Dithering
I compressed the image from 16 million number of colors to only 64 colors and it still looks very nice. The file is three times smaller than the original file.
Image Preferences:
Image resolution: 600x800
File size: 108 KB
Colors: 64
- Without Dithering
I compressed the image and reduced number of colors from 16 million to 256 because there is a lot of blue color (the sky covers more than 60% of the image) and the image much worse. The image file is bigger than the image with dithering because more shades are used.
Image Preferences:
Image resolution: 600x800
File size: 247 KB
Colors: 256
Conclusion:
If we set less colors there will be more small dots in the image (with dithering) and less shades of colors (without dithering).
In the image compressed without dithering there will not be much difference between images with 64 or 128 or even 256 colors.
Result:
It is better to use compressing with dithering because of less size and better quality.
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