docbook-apps

Is there a description anywhere about how to deal with images of different dpi in the FO stylesheets?

I've got an image that is 800x600, and as far as I can tell (identify doesn't say anything about dpi), it is a 300dpi image.

I want that image to pass through to the FO and PDF as a 300dpi image, unchanged.

Does anyone know the magic incantation of imagedata attributes that will cause this to happen? The combination I thought would work (width="100%" contentwidth="100%" scalefit="1", as suggested by Bob's book) gives me an image that is considerably smaller than I expected, and I'm not sure whether the problem is the wrong attributes or if there might be a problem with the image.

Any help would be greatly appreciated.

Best Regards,
Dick Hamilton
-------
XML Press
XML for Technical Communicators
http://xmlpress.net
hamilton@xmlpress.net

When you say "identify", I assume you mean ImageMagick's identify. If the "-verbose" option doesn't give you a specific resolution for an image, then it doesn't have one. Most software will then default to 72DPI.

You can set the resolution with the "mogrify" utility, like so:

mogrify -density 300x300 -units PixelsPerInch foo.png

Hope this helps.

Regards,
Paul Bort
Systems Engineer
TMW Systems, Inc.
pbort@tmwsystems.com
440 721 2233 (voice)
440 290 2662 (fax)

> -----Original Message-----
> From: Richard Hamilton [mailto:hamilton@xmlpress.net]
> Sent: Tuesday, May 15, 2012 4:25 AM
> To: docbook-apps mailing list
> Subject: [docbook-apps] Image resolution in print.
>
> Is there a description anywhere about how to deal with images of different
> dpi in the FO stylesheets?
>
> I've got an image that is 800x600, and as far as I can tell (identify doesn't say
> anything about dpi), it is a 300dpi image.
>
> I want that image to pass through to the FO and PDF as a 300dpi image,
> unchanged.
>
> Does anyone know the magic incantation of imagedata attributes that will
> cause this to happen? The combination I thought would work (width="100%"
> contentwidth="100%" scalefit="1", as suggested by Bob's book) gives me an
> image that is considerably smaller than I expected, and I'm not sure whether
> the problem is the wrong attributes or if there might be a problem with the
> image.
>
> Any help would be greatly appreciated.
>
> Best Regards,
> Dick Hamilton
> -------
> XML Press
> XML for Technical Communicators
> http://xmlpress.net
> hamilton@xmlpress.net
>
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: docbook-apps-unsubscribe@lists.oasis-open.org
> For additional commands, e-mail: docbook-apps-help@lists.oasis-open.org

Paul,

Thanks for the explanation. You're right, it is the ImageMagick identify, and by now I should know to just add -verbose to any command that doesn't give me what I want:-).

FYI, more in my reply to Bob.

Thanks,
Dick
-------
XML Press
XML for Technical Communicators
http://xmlpress.net
hamilton@xmlpress.net



On May 15, 2012, at 5:45 AM, Bort, Paul wrote:

> When you say "identify", I assume you mean ImageMagick's identify. If the "-verbose" option doesn't give you a specific resolution for an image, then it doesn't have one. Most software will then default to 72DPI.
>
> You can set the resolution with the "mogrify" utility, like so:
>
> mogrify -density 300x300 -units PixelsPerInch foo.png
>
> Hope this helps.
>
> Regards,
> Paul Bort
> Systems Engineer
> TMW Systems, Inc.
> pbort@tmwsystems.com
> 440 721 2233 (voice)
> 440 290 2662 (fax)
>
>> -----Original Message-----
>> From: Richard Hamilton [mailto:hamilton@xmlpress.net]
>> Sent: Tuesday, May 15, 2012 4:25 AM
>> To: docbook-apps mailing list
>> Subject: [docbook-apps] Image resolution in print.
>>
>> Is there a description anywhere about how to deal with images of different
>> dpi in the FO stylesheets?
>>
>> I've got an image that is 800x600, and as far as I can tell (identify doesn't say
>> anything about dpi), it is a 300dpi image.
>>
>> I want that image to pass through to the FO and PDF as a 300dpi image,
>> unchanged.
>>
>> Does anyone know the magic incantation of imagedata attributes that will
>> cause this to happen? The combination I thought would work (width="100%"
>> contentwidth="100%" scalefit="1", as suggested by Bob's book) gives me an
>> image that is considerably smaller than I expected, and I'm not sure whether
>> the problem is the wrong attributes or if there might be a problem with the
>> image.
>>
>> Any help would be greatly appreciated.
>>
>> Best Regards,
>> Dick Hamilton
>> -------
>> XML Press
>> XML for Technical Communicators
>> http://xmlpress.net
>> hamilton@xmlpress.net
>>
>>
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: docbook-apps-unsubscribe@lists.oasis-open.org
>> For additional commands, e-mail: docbook-apps-help@lists.oasis-open.org
>