File Format Guidelines

L.Type File Submission Guidelines


The following is a non-exhaustive list of the file preparation requirements for optimal printing of L.Type prints. For further advice as to specific print file suitability please email support@lumejet.com.

CENTRAL TO OUR PHILOSOPHY IS THAT WE NEVER ADJUST YOUR PRINT IN ANY WAY, UNLESS YOU SPECIFICALLY REQUEST IT.

Borders

If you are using our upload and order system online, you will have the option of adding borders of any chosen size to your image. If you submit print-ready files then we assume you will already have applied the required borders to those images. The comments regarding image resolution below should be read in light of your requirements for borders. So for example, a 12”x10” print with 1” borders all round will contain an image sized at 10”x8”.


Print resolution and file size

L.Type prints are printed as 400dpi true continuous tone images in both dimensions. Because we print at a higher pixel density than other printers, the ‘natural size’ at which a given image prints – where every pixel in the original camera image is represented by one pixel on the page – will be smaller than for other printers. For example, an 18”x12” image will contain 7,200 x 4,800 pixels when printed – allowing it to reproduce every pixel from a 35MP camera image. On the other hand, a 3,000 x 2,000 pixel image (6MP) has a ‘natural’ print size of 7.5”x5” when printed as an L.Type (calculated by dividing the number of pixels in the image by 400 in each dimension). We can, of course, print this image at larger sizes. If, say, a 15”x10” print is required, then the finished print will contain 6,000 x 4,000 pixels (24MP), or four times the number of pixels in the supplied file. In other words, each pixel in the supplied file will be represented by four pixels on the printed page.

Images should be supplied to us at this 400dpi resolution at the desired print size to ensure that the maximum image quality is achieved. If images are supplied at lower resolution, then it is possible that there will be some minor loss of image quality as we scale the image up to the desired size. While we use the latest industry standard software to scale images, if you have any concerns about this process it is best to supply your images at the correct 400dpi resolution for peace of mind. In general, we try not to print images that will result in fewer than 200 original image pixels per inch at the selected print size unless particularly requested.

As a guide, a full-resolution A4 image, saved as a Tiff file without compression, is likely to be in excess of 285MB. Therefore JPEG images saved at high or maximum quality are suggested. The exact file size will vary depending on the image composition and content but is likely to be in the order of 5MB - 25MB. Ultimately, we are happy to receive files of any size and you can be confident that we will achieve the best possible results with whatever you send us.


Colour Space

All images should be supplied in Adobe RGB format, with embedded profile, wherever possible. This not only reduces the files size by 25% but also ensures that maximum colour fidelity can be maintained. We can also support sRGB, CMYK and other colour spaces as long as the profile is embedded, but use of smaller colour spaces may not maximize the benefit of our process and colour gamut. It is critical, however, that you do embed a colour profile because without that profile we have no way of telling what your intentions are for your image, and if we make the wrong assumption it is likely that a colour shift will occur. If you prefer to work in a larger colourspace, such as Pro Photo, then you should work in the full 16-bit precision throughout your image editing process to avoid loss of colour accuracy, although you are free to convert the final file to 8-bit as a final step. You should be aware that silver halide’s colour gamut is not as wide as Pro Photo’s.

If there is no embedded profile, then we will attempt to contact you where possible, but if we cannot, will make a default assumption of sRGB. This is because in our experience the majority of devices and software programmes use a default of sRGB as this is the standard colour profile for screen displays.

We pride ourselves on our colour accuracy and believe that our printers are the most accurate in the world within gamut. Every printer is calibrated at least once a day and every time a new roll of paper is used. We build our own target profiles for each paper we use, and have ICC profiles for each media type. These media-specific ICC profiles are available if you wish to soft proof using a calibrated colour-managed monitor.

ICC profiles are available to download ICC profiles here

For further information on how to use our services in a full colour-managed workflow, please contact us, either by phone or by emailing support@lumejet.com We will gladly explain and discuss the best solution for you to capitalise on our outstanding quality and colour fidelity.


What colour space should I save images in?

All images should be supplied, whenever possible, in Adobe 98 RGB format, to take advantage of our colour gamut. We can also support sRGB or any other colour space you choose. It is critical that each image has an embedded profile. We pride ourselves on our colour accuracy and without a profile, we are simply guessing as to what you want. If there is no embedded profile, we will attempt to contact you where possible, but if we cannot, we will make a default assumption of sRGB, which could cause a colour shift to occur. Our own media specific ICC profiles are available if you wish to soft proof using a calibrated colour managed monitor. For further information on how to use our services in a full colour managed workflow please contact us, either by phone or by emailing support@lumejet.com and we will gladly explain and discuss the best solution for you to capitalise on our outstanding quality and colour fidelity.


Sharpening

The L.Type process produces extremely sharp images and text due to its 400dpi true continuous tone printing. However, some photographers do find that their L.Type prints can appear softer than they expect in comparison to other photo services and inkjet machines. This is because many such services and machines automatically sharpen images. As stated above, our core philosophy is never to adjust images and sharpening is very much a matter for personal preference. We recommend, therefore, that having sized your image for 400dpi, you review and adjust the sharpening as necessary. If it looks too soft on-screen, then we will reproduce that, but we will also reproduce the artefacts visible in over-sharpened images. There is no single correct amount of global sharpening that we can advise, as each image is different and sharpening is a matter of taste. There is no better alternative to investing time in optimizing each photograph to your requirements.

Text and Fonts

The document/files should be supplied with all fonts embedded or with the fonts included, if copyright allows. EPS files should include all fonts converted to outlines wherever possible.

Accepted File Formats

The following file types/formats are accepted: PDF, Tiff, JPEG.

Please ensure that PDF files are saved in a high resolution print ready format, with no compression applied to any of the images and elements.

For all formats, please ensure that your working colour profile is embedded.


Maximum Output/Print Size

The maximum finished print size is 305mmx1000mm. Please be aware that this includes any crops and bleed. If you upload photographs using our web upload system, then we will automatically print in the correct size after allowing for any borders you have requested. However, if you send us print-ready files via other routes (including WeTransfer) and require the finished size to be narrower than 305mm then please include crop marks.

Notes on producing designs for LayFlat books

As previously mentioned the maximum finished print size is 305mmx1000mm. therefore any book must be designed to keep within this size range. This will allow you to print a lay-flat book in A3 landscape format (or a little wider).

Please note that the cover will need to be somewhat longer than the inside pages to accommodate the book spine. The exact amount will depend upon the number of body pages within the book. We can give you the correct dimensions once we know the number of spreads and media type and whether or not you require stiffening boards between pages.

In addition to the usual crop marks the pages will also require a centre line for accurate creasing prior to layflat book production. This should be included within the bleed gutter of the design. The addition of crop marks is not necessary if the page dimensions dictate that these could not be included within the 305mm width limitation, as the book production process will naturally trim the final page size.

A PDF Guide to creating Layflat Books and Covers is available, along with InDesign templates here