Re: Sample-based thumbnailing built into libpng?
Glenn Randers-Pehrson <[email protected]>
| Newsgroups | gmane.comp.graphics.png.general |
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| Message-ID | <CA+PdXcubyRkyP_byVXKaNsZy-ReO3UP2bO3mDWVLn0_7DQp9bQ@mail.gmail.com> |
I didn't see your mail right away. It went into the SPAM folder
evidently because of it came from a "yahoo.com" account.
Glenn
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On Fri, Jan 20, 2017 at 6:18 PM, Glenn Randers-Pehrson <[email protected]>
wrote:
>
>
> On Thu, Jan 19, 2017 at 3:21 PM, Andrew Klaassen <clawsoon-/[email protected]>
> wrote:
>
>>
>> A search through this mailing list was frustrated by Sourceforge error
>> messages, but I did find this previous message from 2008 that touches on
>> the topic:
>>
>> https://sourceforge.net/p/png-mng/mailman/message/20296261/
>>
>> I'm not sure from that message whether it's not possible to sample
>> [noninterlaced] PNG files, or whether the poster thinks that it's not
>> useful because decompression is too slow to make it worthwhile.
>>
>
> The message says that it's not possible. That fact is still true. A PNG
> decoder needs all
> the preceding bytes in order to decode a row, because of how zlib
> compression and
> PNG filtering work.
>
> Glenn
>
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