[filmscanners] Re: TIFF file sizes

[Wayne Simpkins]

On 4/26/02 5:08 AM, Simon Lamb [EMAIL PROTECTED] wrote:

 My mind has gone to mush and I cannot work out the following:
 
 I scan a 6X6 frame at 4000ppi and select 48-bit output in Silverfast.  I
 assume the file size will be:
 
 (((2.25x4000)x(2.25x4000))x3)/1024 = 237Mb
 
 However, I am getting a file size of 406Mb.  Where is my calculation wrong?


Simon.

Nothing wrong with your math except it is for 8 bits per channel. 8 bits = 1
byte so the total pixels in and 8 bit/channel file (8 bits/pixel) x channels
is the size in bytes. However, 48 bit output is 16 bits per channel or 2
bytes (2 bytes/pixel for each channel). For 16 bit multiply by 2 (237 x 2 =
468 MB in your example). 406 is probably the file saved to disk with
compression - the disk storage size will not match the file size in RAM
except by coincidence. By the way that¹s MB not Mb, megabytes vs megabits.
 
Wayne

-- 
Wayne Simpkins
The Univ of Memphis
Dept of Art

[EMAIL PROTECTED]


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[filmscanners] Re: TIFF file sizes

[Philip Elkin]

Your maths are for a 8 bit image!

- Original Message -
From: Simon Lamb [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Friday, April 26, 2002 11:08 AM
Subject: [filmscanners] TIFF file sizes


My mind has gone to mush and I cannot work out the following:

I scan a 6X6 frame at 4000ppi and select 48-bit output in Silverfast.  I
assume the file size will be:

(((2.25x4000)x(2.25x4000))x3)/1024 = 237Mb

However, I am getting a file size of 406Mb.  Where is my calculation wrong?

Thanks.

Simon

- Original Message -
From: James L. Sims [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Thursday, April 25, 2002 1:28 AM
Subject: [filmscanners] Re: SS 120 questions


 Simon,

 Once I got Silverfast and Insight into ps7 they work great.  I don't think
you'll have a
 problem.

 Jim

 Simon Lamb wrote:

  That is great news that the plug-ins work.  Would my Insight 5.5.2 and
  Silverfast Ai 5.5 work as normal under PS7?  I am concerned about the
Piezo
  BW plug-in as well, as I use it for all my bw printing.
 
  Simon
 
  On 24/4/02 7:38 am, Op's [EMAIL PROTECTED] wrote:
 
  
  
   Simon Lamb wrote:
  
   I wish I could help, I am still waiting for Adobe to send me my PS7
upgrade!
   I will probably not install it in the short term anyway, as I have my
   workflow adequately supported with PS6 and I don't want to start
having
   configuration issues upset that flow.
  
   I wouldn't have though Adobe would have rewritten the plug-in
interface as
   there was nothing wrong with it., so I would presume that existing
plug-ins
   would work.  Do any other plug-ins work?
  
   PS6 and PS 7 look similar  But as a bonus (among other things) there
is a
   healing tool which
   clones heaps better.
  
   The healing tool will be of benefit to those which do not have ICE -
brilliant
   tool and well
   worth getting a copy of PS7.
  
   Plugins are working the same.
  
   I like the new features.
  
   Rob
 

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