I am finding that saving an output, the results look different if one adds -write xxx before the output image.
It depends upon the format of the xxx image, but especially with gif. This is happening when using -selective blur with or without -mask.
The results appear to be affected by the gif quantization even in the actual output.
Is this a bug or correct behavior?
Look carefully at the top of the image in the gray area to the left of her hair.
Input:
No Write added -- correct result:
imb convert 1tmp12.png -selective-blur 0x2+10% +mask 1tmp21_no_write.png
You may need to flicker the results to see the differences.
Write to gif added -- corrupted, noisy result:
imb convert 1tmp12.png -selective-blur 0x2+10% +mask -write 1tmp_sb.gif 1tmp21_gif_write.png
If I use -mask, it is even worse.
Mask (binary):
No Write added -- correct result:
imb convert 1tmp12.png -mask 1tmp3.png -selective-blur 0x2+10% +mask 1tmp20_no_write.png
Write to gif added -- corrupted, noisy result:
imb convert 1tmp12.png -mask 1tmp3.png -selective-blur 0x2+10% +mask -write 1tmp_sb.gif 1tmp20_gif_write.png
