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Old 08-08-14
ipri ipri is offline
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pro. printing query.

Hi...I have taken a photo into digital lab for printing. After Lightroom work, the image was exported as a JPEG. The file is 11mb. The lab asks for JPEGs to work on. I wanted a 40" wide canvas. They said it would show as pixelated, and, they could see the lightroom processing. They have suggested a 30" max canvas. Any advice very much appreciated.
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Old 08-08-14
mike_j mike_j is offline
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Re: pro. printing query.

DSColorlabs recommend 300 pixels per inch so a 40 inch print should be 12000 pixels wide. You can produce a file this size from Lightroom

Don't confuse pixel count with file size in MB (not mb by the way, that's millibits) because file size is a combination of quality and pixel size. I have just done a test and at 70% quality a 12000 pixel wide image is only 4.5MB file size.

This may help

http://dscolourlabs.co.uk/tech_support.cfm
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Old 08-08-14
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Re: pro. printing query.

Thanks Mike....Re. pixels/inch.( Dots/ inch)...is this set on my camera...or do I enter settings in LR when I export from LR to folder on pc? Ian
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Old 08-08-14
mike_j mike_j is offline
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Re: pro. printing query.

You set both the number of pixels and the quality in Light room export. You can choose various options, I generally define the number of pixels on the long side of the image. Quality is bit subjective. If a jpg is likely to be re-edited it needs to be high as something is lost each time you edit and save. If the jpg is the final product you may be able to reduce quality to 70 or 80%

You can let Light room choose the quality by setting a maximum file size. This is useful for web work where forums have a file size limit.
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