Lightroom: Minimum height/width when printing to a JPEG

  • 11
  • Idea
  • Updated 4 years ago
  • Under Consideration
  • (Edited)
The description regards Lightroom 3.4.1 and the PRINT module.

In Germany printing photographs in 9x13cm (3.543307086614173x5.118110236220472 inch) as well as 10x15cm (3.937007874015748x5.905511811023622 inch) is very common. I am not printing these myself, I want to print them to file and upload them to a service provider who eventually prints the pictures. For some reason the minimum height/weight for a JPEG photograph is 10.16cm (4 inch) which is apparently in conflict with the common sizes mentioned above. I can somewhat get around that by telling LR that my printer is PDFCreator with a custom paper size of 10.01x15.01cm. However this is not 100% accurate and very annoying! Please remove this restriction when printing to JPEG files instead of receiving data from the printer, who is not involved in the printing process...
Photo of red sebi

red sebi

  • 3 Posts
  • 0 Reply Likes
  • bugged

Posted 7 years ago

  • 11
Photo of Frank Elston

Frank Elston

  • 25 Posts
  • 3 Reply Likes
I see the problem using the print module but suspect this is the product of the printer driver in use and the conversion of imperial to metric. However if you are using JPEG files for printing purposes why not export the files using the export function setting size, pixel and aspect ratio to your preference? This seems to work in principle; although I recently used an external print service which arbitrarily chose to enlarge everything to create borderless prints and so produced some undesirable crops!
Photo of red sebi

red sebi

  • 3 Posts
  • 0 Reply Likes
In general I agree with you. But, there is much more to the print module. You can arrange pictures in many ways creating creative images (e.g. http://lightroomkillertips.com/2010/l... ). How would I export those....

So this is still a problem to me!
Photo of Frank Elston

Frank Elston

  • 25 Posts
  • 3 Reply Likes
I now believe this is an SI versus imperial problem and the result of some coarse rounding errors. The problem we experience is down to restrictions in particular printer drivers and the conversion calculations used somewhere along the line.

I agree that it is unnecessary and frustrating for those in a metric world. Which is the majority of countries, isn't it? Perhaps 'pdf creator' works to a different imperial/metric conversion routine from Adobe pdf but my results are I suspect similar.

To illustrate I have an Adobe pdf printer driver with Acrobat. Using Adobe pdf in LR print module and defining a paper size as 150x100mm. This displays as 149.82mm x 99.876mm - still a small imperial to metric conversion error - probably compounded by rounding errors in cm to inch conversion and back again to mm. Further iterations might produce closer accuracy but when I used 150.01 x 100.01 mm LR displayed a different recalculation as 149.931 x 99.830mm! Something I have yet to understand. A similar very small difference occurs entering the imperial dimension provided for 13x9cm. These display as 13.0175x8.9958mm.

With external printing services who knows what other tolerances intervene? These are some in the maths as here, there are more in software for printing control, some in paper making and even more in trimming processes. Put a ruler across different batches of prints and their variation is well beyond the accuracy already achieved. I admit that I would like to come to terms with some of these tolerances too, but that, I suspect, is beyond reasonable expectations.

To be positive an image can fill the entire page using this routine. The resulting JPEG file created had an aspect ratio of 1.501 - what you need within less than 0.1% of 1.5. Cells can be added and dimensions freely modified - within the restriction of page size. So I see no reason why presets cannot be used or created to individual requirement. I have not yet looked at the 'killer tips' template - maybe another day.

Two further comments.
Previously I have created templates with multiple images (8 to view booklets and double gate fold presentations) for ISO size papers A4, A3 as well as non-standard A3+. I had assumed that it was my ineptness that led to frustrating issues in dimension control but now I am thinking perhaps it is the same cause. Rumour has it that NASA had space mission problems with imperial to metric conversion too?

As a small and potentially confusing aside, I believe that general 'automated' printing practice is to use the aspect ratio to 'print to bleed' - enlarging dimensions furthest below that required by the aspect ratio to create an image the correct size. A file with the correct aspect ratio runs the image all edges fractionally (bleeds off the edges). With dimensions out of aspect ratio more image bleeds off two edges - usually centred to avoid white edges on the other. (If printing with borders these are generated in the imaging process and are the same dimension all round with the image enlarged and cropped in ratio to produce image up to all the internal edges - this of course is not the same aspect ratio!

I'd love to find a fast way other than a round trip to Photoshop of creating borders of differing width so as to make an out of aspect ratio image print with variable borders on a standard sizes - ISO, metric or imperial. Any ideas anyone? Any LR plug-ins already out there?
Photo of Benjamin Warde

Benjamin Warde, Employee

  • 483 Posts
  • 74 Reply Likes
Hi Reb,

As I see it, there are two separate issues in your original post:

1. Lightroom should allow units to be displayed in metric.
2. Lightroom should allow JPEG print sizes smaller than 4 inches.

Based on your original post, these both seem like reasonable requests, and I've passed the feedback on to the team.

Thanks,
Ben
Photo of Geoff Walker

Geoff Walker, Champion

  • 214 Posts
  • 43 Reply Likes
Metric can be displayed already Benjamin, it is the 4 inches that is the problem in the Print to Jpeg custom size......
Photo of Frank Elston

Frank Elston

  • 25 Posts
  • 3 Reply Likes
No and yes see my earlier reply. Metric is displayed but imperial/metric conversions are inexact in metric terms and inconsistent over small changes. Things seem to be confounded within pixel rates and aspect ratios. Smaller than 4" can be achieved for example with Adobe pdf as printer driver in page set up but creating a JPEG. Altogether it is unnecessarily difficult, clumsy and inaccurate to wor with metric (and ISO) sizes.
Photo of Benjamin Warde

Benjamin Warde, Employee

  • 483 Posts
  • 74 Reply Likes
Thanks Geoff, I'd overlooked the "Ruler Units" control in the Layout panel. Yet again I am forced to discover that I don't know everything about Lightroom. :-)

-Ben
Photo of Geoff Walker

Geoff Walker, Champion

  • 214 Posts
  • 43 Reply Likes
I can only add - "me too" !
Photo of red sebi

red sebi

  • 3 Posts
  • 0 Reply Likes
Thanks Ben!

I really appreciate you guys considering direct customer feedback :)
Photo of mark larbey

mark larbey

  • 4 Posts
  • 0 Reply Likes
Why don't they have a POD service. The quality is far superior to anything you would get out of a standard printer and you can have all your images in a really nice book.