atw: Re: black and white

Hi Erisa

I'm not sure about software, but it sounds like a densitometer would be
ideal for the purpose. They're quite expensive though, but most print shops
use them and I'm sure they'd be obliging if you were to take in your
samples.

Rgds
Nigel


-----Original Message-----
From: Hadass, Alon [mailto:Alon.Hadass@xxxxxx] 
Sent: Monday, 26 July 2004 11:16 AM
To: austechwriter@xxxxxxxxxxxxx
Subject: atw: Re: black and white

Hi Erisa,

Some graphics packages (like PaintShop Pro) have a feature called =
histogram.
You can use a histogram to view statistical information about your =
image.

If you look at the histogram of the greyscale channel of the image, you =
will see the percentage of your white pixels (255) or your black pixels =
(0). Some programs show a pixel count rather than percentage.

Cheers,
Alon Hadass

-----Original Message-----
From: austechwriter-bounce@xxxxxxxxxxxxx =
[mailto:austechwriter-bounce@xxxxxxxxxxxxx] On Behalf Of erisa linsky
Sent: Monday, 26 July 2004 10:52 AM
To: austechwriter@xxxxxxxxxxxxx
Subject: atw: Re: black and white

Sorry to be boring or obtuse.  No I am not getting muddled.
I am trying to get a clinically acceptable method for detecting the =
effectiveness of lint removal in washing machines.
If I can scan in the fabric and test the percentage of white on =
black,then I will have a test.


>From: "Michael Granat" <mgranat@xxxxxxxxxxxxxx>
>Reply-To: austechwriter@xxxxxxxxxxxxx
>To: <austechwriter@xxxxxxxxxxxxx>
>Subject: atw: Re: black and white
>Date: Mon, 26 Jul 2004 10:40:27 +1000
>
>Well Daryl (C), one can only ever measure the amount of white, as black =

>is an absence of colour and white contains the entire RGB spectrum.
>
>Otherwise, we'd have white screens on B&W TVs and the stations would=20
>only transmit the black bits.
>
>Hey, on the other hand, if we used black paper with white toner,=20
>printing would become so prohibitively expensive that we could actually =

>achieve the "paperless office".
>
>That aside, I did a test greyscale conversion on an image a moment ago=20
>in=3D
>
>HiJaak Pro, which can tell me the properties (aka Image Attributes) in=20
>terms of the bytes size of file, nature of format, pixels area and the=20
>like but, like most other graphics packages that I have seen, will not=20
>tell you the percentage.
>
>Hey, Erisa (Linsky) you're not just getting confused with the dot=20
>screen percentages that a printer (the person, not the device) requires =

>for greyscale printing, are you?
>
>Cheers,
>
>Michael
>
>Michael E. Granat
>T/as Write Ideas
>Technical Communicator
>Without Prejudice. E&OE.
>
>"I have made this letter longer than usual, only because I have not had =

>the time to make it shorter." - Blaise Pascal
>
>
>
>-----Original Message-----
>From: Colquhoun, Daryl [mailto:daryl.colquhoun@xxxxxx]
>Sent: 26 July 2004 10:00
>To: austechwriter@xxxxxxxxxxxxx
>Subject: atw: Re: black and white
>
><snip>
>Or did you mean the percentage of black and white overall in the image?
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