Re: [Jmagick] How to do JPEG Compression Save at 10

Bob,

You are totally right about the units.  I totally missed that part.  I
needed to set the setUnits as Pixels per inch.

And again you are totally right about quality on PNG.  Thank you.  I am new
to this and I am trying to put pieces together for the first time.

Thank you.


Bob Friesenhahn wrote:
> 
> On Thu, 26 Jun 2008, srinivasp wrote:
> 
>> I am trying to set the quality of a png to something lower (for smaller
>> image size).
>> You are right "getQuality" of MagickImage returning a zero 0.
> 
> It used to be that this would return a value of 75 as a default. 
> PNGs don't actually have "quality" since PNG is lossless.  The quality 
> value is used to select various parameters when the file is written. 
> A higher quality value will usually take more CPU to write and is 
> often smaller.
> 
>> Just curious if anybody actually been sucessful in setting the
>> compression/quality. Also when I use setXResolution (90) and
>> setYResolution(90), and resize the image, the output png's x-resoultion
>> is
>> 0.009 and y-resolution is 0.009.
>>
>> I dont know what to infer from that.  Anybody help?
> 
> The PNG units are likely millimeters rather than DPI.  I would have to 
> check the specification to be sure.  The 'units' parameter determines 
> what the values you supply represent.  However, if the native units 
> are metric, then the software has to convert to the native units.
> 
> Bob
> ======================================
> Bob Friesenhahn
> [bfriesen@masked-domain], http://www.simplesystems.org/users/bfriesen/
> GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
> 
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