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From Klearchos Klearchou <klearchos.klearc...@eurodyn.com>
Subject Re: Image Print size and quality
Date Tue, 17 Jan 2012 14:32:40 GMT

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.

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