Author Topic: Basic Stuff?  (Read 3283 times)

Offline XS_VRM

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Basic Stuff?
« on: May 02, 2009, 12:00:40 AM »

Probably really basic stuff but it's got me beat.

Shooting NEF on a D3, using PM on a MACpro to ingest @ 300dpi, converting to Tiff for manipulation and storage, then saving as Jpeg for submission.

My question is about resulting file sizes.

Original RAW starts off at about 12MB roughly 4000 pixels wide.
Generating a TIFF of 40-50MB - the same 4000 pixels wide.
Save that as a JPEG at the highest quality settings in CS2 and I end up with a file of around 4-5MB...... 4000 wide.

I'm being asked to provide files of a minimum 16.5MB in Jpeg - but just can't see how that's possible. At minimum compression Photoshop still disposes of 90% of the data.

How can I possibly produce a Jpeg at 16.5MB from these files without just increasing the width in pixels, which is pointless as far as I can see.

This has brought me to a stop. Very much appreciate any help.

Mike Day based in Scotland.







Offline Karsten

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Re: Basic Stuff?
« Reply #1 on: May 02, 2009, 12:52:42 AM »
I think that what you have been asked to deliver is a 16,5 MB picture when it is open. That is about 17 x 25 cm.
Best Karsten

Offline Frantisek Vlcek

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Re: Basic Stuff?
« Reply #2 on: May 02, 2009, 06:30:43 AM »
I think that what you have been asked to deliver is a 16,5 MB picture when it is open. That is about 17 x 25 cm.
Best Karsten

I would think so as well. The 16.5MB figure is most likely UNCOMPRESSED DATA. To get uncompressed size of your photo in bytes, just multiply the dimensions and bit depth/8, e.g. 4000x2600x3 for 8-bit-per-channel (24-bit) files.

Offline XS_VRM

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Re: Basic Stuff?
« Reply #3 on: May 04, 2009, 02:11:38 AM »
Aahhhh..! Gotcha - at last!

I've actually been submitting files twice that size!

Many, many thanks.

Mike

Good forum this.