[sdiy] OK, one of you computer geeks, explain this..

[Joel Kirchartz]

It depends alot on what programs you are using .... since not all programs 
work the same, even if they produce the same images. can you give me more 
details ??

>From: "Peter Forrest" <pforrest at vemia.co.uk>
>To: "James R. Coplin" <moog at qwest.net>,        "'J. Larry Hendry'" 
><jlarryh at iquest.net>,        "'Synth-DIY'" <synth-diy at dropmix.xs4all.nl>
>Subject: Re: [sdiy] OK, one of you computer geeks, explain this..
>Date: Mon, 31 Jan 2005 09:26:56 -0000
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>
>Of course it's an anomaly, though - a bit like my insurance company wanting 
>to charge me more for third-party liability, fire and theft than for fully 
>comprehensive cover which includes all that **and** damage to my own 
>car......
>This is of course on-topic because I use the car for ferrying synths around 
>practically every week.
>OK, it's not on topic.  I shut up.
>Peter
>
>----- Original Message ----- From: "James R. Coplin" <moog at qwest.net>
>To: "'J. Larry Hendry'" <jlarryh at iquest.net>; "'Synth-DIY'" 
><synth-diy at dropmix.xs4all.nl>
>Sent: Monday, January 31, 2005 5:26 AM
>Subject: RE: [sdiy] OK, one of you computer geeks, explain this..
>
>
>>It would depend on the format used for the colorspace.  A bmp format is 
>>raw
>>and even if it is grey scale but the color space is specified as 24bit, 
>>each
>>pixel will be 24 bits even if they only store the 8 bits of data that make
>>up greyscale.  If you were to convert the greyscale to zillions of colors
>>via 24bit jpg, then the color space compression will give you the gains.
>>
>>All of this is dependent on the application you are using for the 
>>scanning,
>>how the pdf translator deals with the info, etc.
>>
>>James R. Coplin
>>***************
>>If anyone asks of my whereabouts,
>>simply tell them i've gone out the window
>>for a spot of tea and am not
>>expected back any time soon.
>>***************
>>
>>>-----Original Message-----
>>>From: owner-synth-diy at dropmix.xs4all.nl [mailto:owner-synth-
>>>diy at dropmix.xs4all.nl] On Behalf Of J. Larry Hendry
>>>Sent: Sunday, January 30, 2005 5:37 PM
>>>To: Synth-DIY
>>>Subject: [sdiy] OK, one of you computer geeks, explain this..
>>>
>>>While this pertains to scanning and file structure, it is not off topic
>>>because I am scanning synth schematics.  Due to the black and white
>>>scanning
>>>I have done in the past, I pretty much understand how to minimize PDF 
>>>file
>>>size for a given resolution (through the BMP file).  However, I am now
>>>working on documents that require color and grayscale. While some of the
>>>document is color, about 2/3 is grayscale.  So, I thought I would save
>>>file
>>>size by scanning those in gray instead of color.
>>>
>>>Here is what puzzles me. Let me throw some file sizes out there for one 
>>>of
>>>my large 11x17 pages to see if any of this makes sense.
>>>
>>>This page was scanned (paste a few together) in grayscale as a bitmap and
>>>results in 13.2 MB file size.  I normally scan everything to Bitmap and
>>>then
>>>convert to PDF as that has always given me the most efficient file size
>>>(past B&W experience).  So, I convert the file to a PDF and the resulting
>>>file is about 2.6 MB.  Well, I was hoping for better, but I thought that
>>>was
>>>it.  Then, I started noticing some of the color pages were smaller once
>>>converted to PDF.  I wondered why since the color BMP files were so much
>>>larger.  So, as an experiment, I took my 13.2 MB grayscale page and
>>>converted it to full 16 million colors file in my photo editor.  As
>>>expected, the file size jumper up to 39.7 MB.  I'm still understanding OK
>>>up
>>>to here.  But, now I take that color file and convert it to PDF.  The
>>>resulting file is only 1.15 MB.
>>>
>>>So in summary,
>>>gray file started 13.2 MB bitmap
>>>converted to PDF @ 2.6 MB
>>>
>>>same gray file to full color = 39.7 MB
>>>converted that color file to PDF @ 1.15 MB
>>>
>>>Of course, since the original source file was grayscale, even the color
>>>PDF
>>>looks grayscale.  In fact I cannot tell the two images apart.  However,
>>>the
>>>one that was converted to the very large color file first ended up the
>>>MUCH
>>>smaller file size when converted to PDF.
>>>
>>>If any of you who are considerable more geeked than I concerning 
>>>computers
>>>can 'splain this to me and Lucy, that would be great.  Maybe I will learn
>>>something that will help me additionally control the file size on these
>>>large, highly detailed scans.
>>>
>>>Larry Hendry
>>>computer geek NOT.
>>>:-)
>>>
>>>
>>
>>
>>
>>
>
>