[Digikam-users] Re: aspect ratio crop tool

[Gilles Caulier]

So, this entry still valid ?

https://bugs.kde.org/show_bug.cgi?id=273433

Gilles Caulier

2011/5/16 Dan McDaniel <dan at dm3.us>:
> On Mon 16.May.11 13:03, David Kerber wrote:
>>On 5/16/2011 12:51 PM, Remco Viëtor wrote:
>>> 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).
>>
>>Yes, true.  It looked to me like the OP was leaving on of the dimensions
>>of his original image unchanged, and trying to crop only the other
>>dimension.  That would work only if the original dimensions were such
>>that a factor of multiplying or dividing by 1.25 would give an integer
>>result.
>>
> No, I was trying to crop a box out of the original at the selected
> aspect ratio and was puzzled when it didn't crop exactly. Checking the
> option box makes it work as I expected it to work by default.
>
> Thanks to all who replied.
>
> Dan
>>
>>> 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.
>>
>>I didn't know that; it would be handy.
>>
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>
>
> --
> Dan McDaniel
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