Need to Crop....What Output Size?

[jml]

In shooting with my new 5D I have for example 12.7MB files at

2912x4369 (shot vertically in this case). I am going to have to do

some major cropping. I did a terrible job in filling the

frame....too many years with the 10D I guess...or how I'd like to

excuse myself :-( Anyway, some of the pics will be 8x10 or even

11x14 or 16x20 for one of them. So, should I up the size output

from the Workflow Options window in the RAW processing rather than

later?

 

And how much? I know it's variable depending on how much I crop,

but for most of the pics it's a great deal. Is there a formula for

knowing what my minimum pixel size should be for a certain print

size? And not lose quality? Help! and thanks.

[recent]

I'm not the greatest expert in the field but I think if you experiment in Photoshop or whatever application you use you can determine some good figures.

 

300 line pairs is ok for printing for most online services like Shutterfly so from there it's just a matter of calculating the right size print and basic math. Use the adjustable crop tool in photoshop, it comes with presets up to 8x10 at 300lp and you can create custom ones.

 

Once you have your desired measurements just run the original through the process again setting the size parameters.

 

If you have to upsize you'd want to do it in RAW but unless you want print pretty darn big I'd bet that 5D will pretty will have you covered and you will be downsizing a bit...

 

As I confessed I don't consider myself a bona fide expert in this area however :)

[mike cary]

Jan,

<p>

Are you going to printing them yourself or send them out? If you�re sending them out check with the printers to see if they want you to upsize the files or if they prefer to do it in house as some printing companies prefer to do the interpolation/upsizing in house. In this case you�d just send the crop non-interpolated file(s) to them.

 

</P>

Mike

[mark pav]

According to <i>Photoshop CS2 Killer Tips</i>, you're better off upsizing in ACR. Just make

sure you open the shot in 8 bits, not 16.