Keeping in mind the minimum target configuration of 256 colours the pictures mode was changed from thousands to 256 colours. This sort of a conversion gives a very dithered look to the picture.
Source: wiktionary
Dithered
Synonyms for "dithered" (11 found)
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More general
4 entriesMore specific
8 entriesCollocations
12 entriesdithered approachdithered decisiondithered outcomedithered policydithered responsedithered stancedithering techniqueimage ditheringnoise ditheringordered ditheringquantization ditheringrandom dithering
Inflections
4 entriesDerivations
5 entriesSample sentences
3 total sentences available.
Being able to apply lossy compression to parts of an image affords a whole new realm of control: only areas in an image that have a very dithered texture, such as beaches and streets, can benefit from lossy compression, as can dark areas where the human eye is less capable of distinguishing hues.
Source: wiktionary
If users have their monitors set to 16-bit and they're looking at a 24-bit color, they get a dithered color also, but the higher resolution of 16-bit versus 8-bit means that the computer can choose closer colors, so the dither doesn't look as obvious.
Source: wiktionary