Scale down to fit an image in FOP

Question

I am using FOP version 1.0 to create PDFs. In one of the pages I'd like to display an image (2552 x 4200 pixel) and scale it down if it doesn't fully fit on the page. As far as I could see on the mailing list the recommended way of doing this would be following:

<fo:external-graphic inline-progression-dimension.maximum="100%" 
                     content-height="scale-down-to-fit" 
                     content-width="scale-down-to-fit" 
                     src="..."/>

Unfortunately, that still doesn't display the whole image. The lower part of the image is cut off. Can anyone give me a hint on what I am potentially doing wrong?

I included a TIFF image in a small FO file using `fo:external-graphic` exactly as you did, and the output was fine. I could not reproduce the problem. Can you provide some more information (perhaps a link to the image in question)? — mzjn, Jun 05 '11 at 16:55
Unfortunately, the image is confidential so I cannot provide you with an image. — Benjamin Muschko, Jun 06 '11 at 15:48
I could make this work by defining the exact height and width of the "viewport": ``. Can anybody explain to me why I apparently have to define that in my case? — Benjamin Muschko, Jun 15 '11 at 20:07
@BenjaminMuschko Did you ever figure out why you had to do this? — Michael Berry, Jan 01 '13 at 20:10
Check if this can help you http://stackoverflow.com/questions/6141298/how-to-scale-down-a-uiimage-and-make-it-crispy-sharp-at-the-same-time-instead/7775470#7775470 — Sumit Sharma, Jul 15 '13 at 12:57

score 18 · Answer 1 · answered Aug 06 '14 at 09:54

18

I found this page here explaining how scaling works with XSL-FO.

Essentially, this is the snippet that I used to make it work:

<fo:external-graphic
    src="url('...')"
    width="100%"
    content-height="100%"
    content-width="scale-to-fit"
    scaling="uniform"
    xsl:use-attribute-sets="img"/>

I found that width="100%" was the missing piece in your own attempts. Hope this helps future visitors.

answered Aug 06 '14 at 09:54

Lukas Eder

211,314
129
689
1,509

`width="100%" content-width="scale-to-fit"` seems to be enough. – Monkey Supersonic Feb 16 '21 at 09:25
This will grow the image height outside its container even if it has a specified height. – Johncl Jun 23 '23 at 14:48

score 3 · Answer 2 · answered Apr 18 '13 at 11:30

3

Defining the exact height and width of the "viewport": .

If you don't specify the viewport then FOP won't know what to scale your image to.

It can guess, but not know precisely.

answered Apr 18 '13 at 11:30

WonderWorker

8,539
4
63
74

Unfortunately, I don't have access to the project anymore. I'd love to try this out. – Benjamin Muschko Jul 17 '13 at 21:18

Scale down to fit an image in FOP

2 Answers2

Linked