Re: MNG decoder performance very bad

At 04:21 AM 8/15/03 +0200, Markus Meyer wrote:
>Glenn,
>
>Am Fre, 2003-08-15 um 03.48 schrieb Glenn Randers-Pehrson:
>> At 07:48 PM 8/14/03 +0200, you wrote:
>> >
>> >Time (ms)  Function
>> >----------------------------------------------
>> >1401,371  _filter_paeth (libmng_filter.obj)
>> 
>> Try using the sub filter or "none" filter when compressing your images.
>> The Paeth filter is the slowest PNG filter to decompress.
>
>Thanks for the quick answer! Maybe you can recommend a program which is
>able to write such images?

maybe ImageMagick (depends on what MNG features are present in your files)

convert in.mng -quality 90 none.mng

or

convert in.mng -quality 91 sub.mng

The 10's digit of the quality parameter is the zlib compression level (1-9)
and the ones digit is the PNG filter type (0: none, 1: sub, 2: up,
3: average, 4: Paeth, or 5: adaptive).

"convert" does require a lot of memory because it reads all images into
memory before writing anything.

Glenn

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