Sorry, not enough coffee yet I guess. But the point is that rounding
will eventually cause some points that were previously distinct
brightness levels to coalesce.
Chuck Norcutt
Ian Nichols wrote:
> On 14/07/06, Chuck Norcutt <chucknorcutt@xxxxxxxxxxx> wrote:
>
>>
>>With only 256 integer brightness levels available in a JPEG if the
>>brightness is increase by multiplying by, say, 1.5 then a brightness
>>level of 100 becomes 150. But so does a brightness level of 101 become
>>150.
>>
>
>
> Eh? surely a brightness level of 101 would become 151 when multiplied by
> 1.5 and clipped to an integer (would be 152 if using real maths and rounding
> to nearest integer).
>
>
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