[Digikam-users] Re: aspect ratio crop tool

[sleepless]

Op 16-05-11 18:51, Remco Viëtor schreef:
> on Monday 16 May 2011, David Kerber wrote:
>> On 5/16/2011 11:42 AM, Dan McDaniel wrote:
>>> I have noticed that very often the Aspect Ratio Crop Tool does not crop
>>> accurately, but will be off by pixel.  So, for example, if I want  a 5:4
>>> aspect ratio which should be 1.25 the crop will be off by a pixel and
>>> give a ratio of 1.2499 or such.
>>>
>>> This small difference does not affect the look of the image, but when I
>>> send it to the photo service to be printed the software detects that it
>>> is not in the correct ratio and each time I have to tell it that it's OK
>>> to crop the image.
>>>
>>> Has anyone else noticed this? I'm using 1.2.0 on Debian and 1.9.0 on
>>> Fedora and both exhibit this behavior.
>>>
>> Are your originals' sizes such that 1.25 will give an exact pixel
>> result, and not have to be rounded either up or down to get to a whole
>> pixel?
>>
> the size of the original isn't important, the size of the crop is:
> if you take a length of 1003 pixels, there's no way you can get the 5:4 ratio
> exact on pixel level, as we only use whole pixels: you'd have to make the long
> edge either 1000 (giving 800 for the short side) or 1005 (804 for the short
> size).
>
> Already in 1.9.0 (and a few versions before iirc) there is the 'exact ratio'
> option, which indeed limits the sizes you can pick so that you get the exact
> ratio specified.
>
> Remco
I tested it anyway and it did actually correct my selections to the 
right aspect as I checked the option afterwards.
But it can be missed because the option disappears if you move the 
divider to the utmost right. So if you don´t see the option, move the 
divider to the left.
Rinus
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