[Coco] Initial Tests and Results

[Michael Wayne Harwood]

Misprint!!  "If you look over the grfx_all.txt file" in the File Sizes
section should read "If you look over the sizes.txt file".

Sorry!

Regards,
Michael Harwood



> I have been gathering data to use in determining what standards should be

> set for several aspects of the Rainbow on Disc project.  There are two

> distinct aspects I was seeking to gather data for: 1) appropriate

> standards for the orginal scans of the magazines, and 2) end product post

> production issues.  This email is meant to be a quick summary of the work

> done so far - I apologize for the somewhat haphazzard way this is

> presented - this information is provided as a starting point for

> discussion.

>

>

> Files on the Web

> ----------------

>

> I have placed several .pdf files on my website for reference.  The largest

> of them is 2.8mb in size, but please bear in mind that my web server is on

> the other end of a consumer DSL connection.  My uplink is rated for a

> maximum speed of 384kbps, so if multiple people are downloading things it

> may be a bit slow.  The following is a list of the files that are

> pertinent to this post:

>

> A summary of file sizes.

> http://www.musicheadproductions.org/coco/sizes.txt

>

> PDF files that summarize the tests.  150ppi.pdf, 200ppi.pdf, and

> 300ppi.pdf all have three pages each - the first page is a scan at 1bit

> black and white, the second page is a 24bit color scan, and the third page

> is the result of post processing (see the section below regarding this).

> The grfx_all.pdf file is to show the results of what a scan of a page with

> full color graphics would look like at different scan resolutions.

> grfx_all.pdf has three pages - page 1 is a 150ppi scan, page 2 is a 200ppi

> scan, and page three is a 300ppi scan.

> http://www.musicheadproductions.org/coco/150ppi.pdf

> http://www.musicheadproductions.org/coco/200ppi.pdf

> http://www.musicheadproductions.org/coco/300ppi.pdf

> http://www.musicheadproductions.org/coco/grfx_all.pdf

>

>

> File Sizes

> ----------

>

> If you look over the grfx_all.txt file you can see a summary of the file

> sizes I came up with throughout all of the steps.  I feel the results

> documented are fairly self explanatory, but if for some reason I have left

> out information that would make things clearer please let me know.

>

>

> Post Processing

> ---------------

>

> To get the result from page 3 of the example .pdf files (300ppi.pdf, etc)

> I used two scans of the same page (24bit color and 1bit B&W) so that I

> could use the 1bit black and white scan to create a mask applied to the

> 24bit color scan so that only the color information I wanted to show would

> come through.  The end product looks quite a bit cleaner that the orginal

> 24bit color scan, though there is a little loss in graphic quality.

>

> Here are the steps I used:

> 1. Load the 24bit color scan into the Gimp

> 2. Load the 1bit B&W scan as a second layer on top of the color layer 3.

> Use the "Select a color" tool to select all the black areas in the B&W

> layer.

> 4. Clear all of the selected black areas in the B&W layer to make these

> areas transparent - the bottom color layer should now show through the

> areas cleared.

> 5. Merge the layers

> 6. Save the result

>

>

> Regards,

> Michael Harwood

> /Any spelling errors are intenshunal/

>

>

> --

> Coco mailing list

> Coco at maltedmedia.com

> http://five.pairlist.net/mailman/listinfo/coco

>



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 the best time to be is now."
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