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Date: Sat, 20 Dec 2014 18:30:40 -0600 (CST)
From: Bob Friesenhahn <bfriesen@simple.dallas.tx.us>
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To: Even Rouault <even.rouault@spatialys.com>
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Cc: TIFF <tiff@lists.maptools.org>
Subject: Re: [Tiff] Unnecessary bigger JPEG-compressed TIFF
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On Sun, 21 Dec 2014, Even Rouault wrote:

> Bob,
>
>> Have you compared JPEG-compressed TIFF output sizes with original JPEG
>> files?
>>
>> Perhaps GraphicsMagick (and ImageMagick) are doing something wrong,
>> but TIFF with JPEG compression is looking a *lot* larger than original
>> JPEG files:
>
> Caused by my recent change ?

No.

> Perhaps due to -quality 90 ? You should make sure to use
> the same quality settings, and for the comparison to be fair, you should
> use the same input file.

The original JPEG input used a quality factor of 90.

> And from my testing with old imagemagick it seems that gm convert
> doesn't produce a YCbCr JPEG-compressed TIFF.

Hmmm ...

Does YCbCr make that big of a difference?

Bob
-- 
Bob Friesenhahn
bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
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