#1 Use of Lab2ToLab4 on normalized Lab values is incorret

closed
nobody
5
2007-06-11
2005-08-17
Anonymous
No

ApplyNamedCmm uses nomalized (Internal
representation) Lab values (L,a and b are in the range 0
to 1). Use of Lab2ToLa4 on these numbers does not
create the same effect as using it on non normalized
values. A numeric bias of (65535 / 65280 -1)*128 is
introduced. Since the spec calls for the non normalized
values to be multiplied by 65535 / 65280 it looks to me
that the application (works with normalized values)
needs to be changed so that the bias is not introduced.

Eric Paneth
eric@orckit.com

Discussion

  • Max Derhak
    Max Derhak
    2007-06-11

    • status: open --> closed