Re: [Boost-users] Some problems about GIL

Subject: Re: [Boost-users] Some problems about GIL
From: blp330 (blp330_at_[hidden])
Date: 2008-11-16 22:09:43

Thank your answers. :)

For the problem 2, I mean I need a raw image buffer **with png format**
including header and not just pixels. png_io's png_write_view only writes
png format to file. I must pass that data to other library to do something.
If I write png to file than read it to memory then pass it, it might be too
slow. 

How to do that? 

For the problem 3, If I can make sure that two images **always** have the
same format (png), the same size, the same layout of the channels, and the
same channel depth...etc. Is there any good performance way to do that? 

I am not sure that to compute Mean Absolute Error is the best way to do
that. I just simply follow the recommendation of ImageMagicks
(http://www.imagemagick.org/Usage/compare/). But after this review, I found
MAE is used to compute "how different are two images"... oh, actually, I
don't need to know how difference, I just want to know two images are
different. :( 

I think that simply pixel by pixel comparison might be the fastest way to do
that?

Thank you very much.

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