VoyForums
[ Show ]
Support VoyForums
[ Shrink ]
VoyForums Announcement: Programming and providing support for this service has been a labor of love since 1997. We are one of the few services online who values our users' privacy, and have never sold your information. We have even fought hard to defend your privacy in legal cases; however, we've done it with almost no financial support -- paying out of pocket to continue providing the service. Due to the issues imposed on us by advertisers, we also stopped hosting most ads on the forums many years ago. We hope you appreciate our efforts.

Show your support by donating any amount. (Note: We are still technically a for-profit company, so your contribution is not tax-deductible.) PayPal Acct: Feedback:

Donate to VoyForums (PayPal):

[ Login ] [ Contact Forum Admin ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 1, 2, 3, 4, 5, 6, 7, 8, 9, [10] ]

[ Next Thread | Previous Thread | Next Message | Previous Message ]

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,

Michel

> 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

[ Next Thread | Previous Thread | Next Message | Previous Message ]

Replies:

[ Contact Forum Admin ]

Forum timezone: GMT-5
VF Version: 3.00b, ConfDB:
Before posting please read our privacy policy.
VoyForums(tm) is a Free Service from Voyager Info-Systems.
Copyright © 1998-2019 Voyager Info-Systems. All Rights Reserved.