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From Pascal Sancho <pascal.san...@takoma.fr>
Subject Re: Image Print size and quality
Date Mon, 23 Jan 2012 09:08:54 GMT
Hi,

can you provide a short XSL-FO (not XSLT) with equivalent images that
reproduce what you describe here, I cannot figure what you say.

Le 20/01/2012 16:29, Klearchos Klearchou a écrit :
> Hello Pascal,
> 
> the solution that we talked about works well almost in all cases.
> Here is the code:
> <fo:external-graphic src="{$imageLink}" border="solid 3px #8CE18D"
>                                  
> inline-progression-dimension.maximum="{$imageMaxBoundary}"
>                                  content-width="scale-to-fit"
>                                  
> block-progression-dimension.maximum="{$imageMaxBoundary}"
>                                  content-height="scale-to-fit"
>                              />
> 
> Now when the image is rectangle the scale does not work.
> I am attaching an image, on the left hand side the image is 310 x 300 
> and FOP scales it well.
> On the right hand side is the same image but 300 x 300. As you can see 
> FOP fails to scale it.
> It overflows out of the box.
> 
> Do you have any idea what it could be?
> 
> Thank you in advance
> 
> 
> On 1/17/2012 5:47 PM, Pascal Sancho wrote:
>> We use imageMagik
>>
>> Le 17/01/2012 15:32, Klearchos Klearchou a écrit :
>>> Pascal,
>>>
>>> the information that you provide are valuable.
>>> Can you propose any open source library in order to manipulate the
>>> quality/resolution of the image?
>>> I tried the imgscalr, getScaledInstance(), Thumbnailator and some more
>>> but they do not provide em exactly what I want.
>>> I haven't tried yet JMajick.
>>>
>>> Thanks again.
>>>
>>>
>>> On 1/17/2012 4:18 PM, Pascal Sancho wrote:
>>>> Quality loss may depend on PDF viewer settings and capabilities
>>>>      (anti-aliasing, zoom factor, etc.)
>>>> Also, the result can seem better if you first resample your image before
>>>> using in PDF, to get the best fit on screen reading, but can become
>>>> worse on printing.
>>>>
>>>> Depending on what usages your PDF are for (reading on screen, Laser
>>>> printing, Offset printing, low weight downloading, etc.)
>>>> There is no perfect solution there.
>>>>
>>>> For example, we (my compagny) produce images with different
>>>> quality/resolution for identified purposes, and generate as many PDF files.
>>>>
>>>> The only constant over various resampled images is the real size:
>>>> for instance, a square image (1"x1") will give:
>>>> 96x96, rez 1/96" for screen reading;
>>>> 300x300, rez 1/300" for Laser printing;
>>>> 120x120, rez 1/120" for Dowload _and_print;
>>>> etc.
>>>>
>>>> Le 17/01/2012 14:48, Klearchos Klearchou a écrit :
>>>>> Hi Pascal,
>>>>>
>>>>> yes indeed this was one of my problems.
>>>>> I will test it to see the results.
>>>>>
>>>>> In case I will still have to manipulate the image outside of the FOP
do
>>>>> you have any solution to propose regarding:
>>>>> How to change the print size of the image (like gimp) in order not to
>>>>> loose image quality and at the same time to show it smaller inside the
PDF.
>>>>>
>>>>> Thank you.
>>>>>
>>>>> On 17/1/2012 3:42 PM, Pascal Sancho wrote:
>>>>>> Hi,
>>>>>>
>>>>>> I guess that by "the result is problematic with very tall images"
you
>>>>>> mean that image can overflow the page when h/w ratio is too high.
>>>>>>
>>>>>> If this is the case, you can use "max-height" XSL-FO equivalent:
>>>>>>
>>>>>> <fo:external-graphic src="{$imageUrl}"
>>>>>>        block-progression-dimension.optimum="$my_minimal_height"
>>>>>>        block-progression-dimension.maximum="$my_maximal_height"
>>>>>>        content-height="scale-to-fit"/>
>>>>>>
>>>>>> Le 17/01/2012 12:17, Klearchos Klearchou a écrit :
>>>>>>> Dear FOP users,
>>>>>>>
>>>>>>> I want to change an image's print size in order to add it inside
a PDF.
>>>>>>> I want to do this in order not to loose any quality.
>>>>>>> The image must look smaller inside the PDF but the quality should
be the
>>>>>>> same with the original image.
>>>>>>>
>>>>>>> I know that I could do something like this in my XSLT
>>>>>>> (content-width="scale-to-fit"):
>>>>>>>
>>>>>>> <fo:external-graphic src="url('{$imageLink}')"
>>>>>>> content-width="scale-to-fit" border="solid 0.1pt" width="90mm"
/>
>>>>>>> <fo:block space-before="{$space}"/>
>>>>>>>                                         (<xsl:value-of select="$title"/>)
>>>>>>> <fo:block/>
>>>>>>> <xsl:value-of select="$description"/>
>>>>>>> </fo:block>
>>>>>>>
>>>>>>> but the result is problematic with very tall images.
>>>>>>>
>>>>>>> Thus I thought that I should manipulate the image before passing
it to FOP.
>>>>>>> I used GIMP and I saw that if I change the print size of the
image FOP
>>>>>>> uses this size and the quality of the image is very good.
>>>>>>>
>>>>>>> Anybody knows how to solve this problem?
>>>>>>>
>>>>>>> Thank you in advance.
>>
> 

-- 
Pascal

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