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Date Posted: 08:49:15 04/29/00 Sat
Author: Michel
Subject: Re: Size of selection in Cms with zoom
In reply to: Jorge Neudorfer 's message, "Size of selection in Cms with zoom" on 11:37:03 04/28/00 Fri

Hi Jorge,

What you are doing is correct. I guess what you are missing is the "Resolution" to obtain physical dimension.

The window api calls,

GetDeviceCaps(DeviceContext, LOGPIXELSX);
GetDeviceCaps(DeviceContext, LOGPIXELSY);

Allow obtaining the resolution in pixels per inch for a device context.

If you are using a TDibGraphic, you can use the DC property as the device context.

Best regards,


> Hello to all, I need to know the size of a selection
> that I make on an image having in account the
> percentage of Zoom lens that exists on the image. When
> the percentage is in 100 percent I do it of the
> following way
> Inches = pixels/ Resolution
> Cms = 2.54 * Inches
> Thanks for your help
> Please a need do this

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