Re: [darktable-user] exporting jpegs: 'quality %'

[Patrick Shanahan]

* darkta...@911networks.com  [12-17-16 20:15]:
> On Sat, 17 Dec 2016 18:37:14 -0500
> Patrick Shanahan  wrote:
> 
> >And WHAT is the actual meaning/value of "1 to 12"?  w/o that
> >knowledge, *any* answer is mere supposition.  bighter than the moon
> >but dimmer than the sun.
> 
> "I", aka me, don't know what is the meaning of 1 to 12. No idea why
> Adobe did it that way.
> 
> I was just asking if anybody had an equivalency table. I didn't mean
> to start a rebellion against the empire...

not a "rebellion", but for most here, photoshop is an unknown, not used,
so you are asking for knowledge in the wrong forum.  Present the values or
meaning of "1 to 12" in photoshop and I am sure that you can get answers
to your question.


-- 
(paka)Patrick Shanahan   Plainfield, Indiana, USA  @ptilopteri
http://en.opensuse.orgopenSUSE Community Memberfacebook/ptilopteri
Photos: http://wahoo.no-ip.org/gallery2  Registered Linux User #207535  
  
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Re: [darktable-user] exporting jpegs: 'quality %'

[Pascal Obry]

Le samedi 17 décembre 2016 à 10:09 -0800, darkta...@911networks.com a
écrit :
> I've been asked to do value 10 and 6. What would be the equivalent in
> DT?

For 10: (10 / 12) * 100  => 83%
For  6: ( 6 / 12) * 100  => 50%

If the Photoshop values ranging from 1 to 12 are not linear across the
quality percent then you should ask what Adobe means with those values
:)

Another way to check that is to export with 83% and 50% and check the
final image size compared to the 10, 6 export from Photoshop.

-- 
  Pascal Obry /  Magny Les Hameaux (78)

  The best way to travel is by means of imagination

  http://www.obry.net

  gpg --keyserver keys.gnupg.net --recv-key F949BD3B

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Re: [darktable-user] exporting jpegs: 'quality %'

[Patrick Shanahan]

* darkta...@911networks.com  [12-17-16 14:11]:
> On Sat, 17 Dec 2016 13:54:52 -0500
> Patrick Shanahan  wrote:
> 
> >what %'s do the values 10 and 6 represent?  one w/o photoshop has no
> >knowledge.  are the other "steps (1 to 12)" relevant to your request?
> >
> >one would guess "quality %" would relate to a percentage of 256,
> >but ... -- 
> 
> In photoshop:
> 
> https://helpx.adobe.com/photoshop/how-to/save-as-jpeg.html
> 
> step 4 of 4 
> 
> The values of 'Quality' range from 1 to 12

And WHAT is the actual meaning/value of "1 to 12"?  w/o that knowledge,
*any* answer is mere supposition.  bighter than the moon but dimmer than
the sun.

-- 
(paka)Patrick Shanahan   Plainfield, Indiana, USA  @ptilopteri
http://en.opensuse.orgopenSUSE Community Memberfacebook/ptilopteri
Photos: http://wahoo.no-ip.org/gallery2  Registered Linux User #207535  
  
Photos: http://wahoo.no-ip.org/piwigo@ http://linuxcounter.net

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Re: [darktable-user] exporting jpegs: 'quality %'

[Marc Cousin]

On 17/12/2016 20:10, darkta...@911networks.com wrote:
> On Sat, 17 Dec 2016 13:54:52 -0500
> Patrick Shanahan  wrote:
>
>> what %'s do the values 10 and 6 represent?  one w/o photoshop has no
>> knowledge.  are the other "steps (1 to 12)" relevant to your request?
>>
>> one would guess "quality %" would relate to a percentage of 256,
>> but ... -- 
> In photoshop:
>
> https://helpx.adobe.com/photoshop/how-to/save-as-jpeg.html
>
> step 4 of 4 
>
> The values of 'Quality' range from 1 to 12
>
Well, almost anything but lightroom uses percentage for jpeg export…

This article seems to give pointers:
https://photographylife.com/jpeg-compression-levels-in-photoshop-and-lightroom


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Re: [darktable-user] exporting jpegs: 'quality %'

[darktable]

On Sat, 17 Dec 2016 13:54:52 -0500
Patrick Shanahan  wrote:

>what %'s do the values 10 and 6 represent?  one w/o photoshop has no
>knowledge.  are the other "steps (1 to 12)" relevant to your request?
>
>one would guess "quality %" would relate to a percentage of 256,
>but ... -- 

In photoshop:

https://helpx.adobe.com/photoshop/how-to/save-as-jpeg.html

step 4 of 4 

The values of 'Quality' range from 1 to 12

-- 
sknahT

vyS

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Re: [darktable-user] exporting jpegs: 'quality %'

[Patrick Shanahan]

* darkta...@911networks.com  [12-17-16 13:10]:
> Hi,
> 
> DT 2.0.7 on arch.
> 
> When exporting:  format jpeg(8bit). 
> 
> Is there somewhere a table that match the 'quality %' to the Photoshop
> steps (1 to 12)?
> 
> I've been asked to do value 10 and 6. What would be the equivalent in
> DT?

what %'s do the values 10 and 6 represent?  one w/o photoshop has no
knowledge.  are the other "steps (1 to 12)" relevant to your request?

one would guess "quality %" would relate to a percentage of 256, but ...
-- 
(paka)Patrick Shanahan   Plainfield, Indiana, USA  @ptilopteri
http://en.opensuse.orgopenSUSE Community Memberfacebook/ptilopteri
Photos: http://wahoo.no-ip.org/gallery2  Registered Linux User #207535  
  
Photos: http://wahoo.no-ip.org/piwigo@ http://linuxcounter.net

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