Re: NSImageCompressionFactor

[Lundberg, Johannes]

Thanks!

On Wednesday, May 21, 2014, Riccardo Mottola <riccardo.mottola@libero.it> wrote:
> Hi,
>
> Lundberg, Johannes wrote:
> > Well, the GNUstep documentation clearly states that it is from 0 - 255 so maybe it something that Apple changed recently? We also have to update the documentation and think about all the programs we will break if changing the functionality...
> I found this code in our JPEG handling:
>
>   if (qualityNumber != nil)
>     {
>       quality = (int) ((1-[qualityNumber floatValue] / 255.0) * 100.0);
>     }
>
> it is clearly expecting something between 0 and 255 and in "reversed" way, since Cocoa states that 0 is lowest quality, 1 highest.
>
> This assumption (and back-and-forth conversion) is all over NSBitmapImageRep.
>
> I fixed that to my best. Please try!
>
> Maybe I have forgotten something elsewhere.
>
> Now, in PRICE, if I compress the same image with different settings, I do get:
>
> -rw-r--r--  1 multix  staff   14751 May 21 16:44 linhof_00.jpg
> -rw-r--r--  1 multix  staff  451980 May 21 16:46 linhof_100.jpg
> -rw-r--r--  1 multix  staff   41743 May 21 16:44 linhof_25.jpg
> -rw-r--r--  1 multix  staff   86293 May 21 16:44 linhof_75.jpg
> -rw-r--r--  1 multix  staff  355566 May 21 16:46 linhof_98.jpg
>
> which looks much more reasonable than before!
>
> Riccardo


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Johannes Lundberg

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