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Date Posted: 06:18:51 08/06/02 Tue
Author: Michel
Subject: Re: Questions about the TResizeTransform
In reply to: yoshi 's message, "Re: Questions about the TResizeTransform" on 23:39:37 08/03/02 Sat

Hi Yoshi,

You cannot now in advance. It will depend on the version of windows, the video driver, and the color mode (16 bit, 32, etc...).

For the filters, I don't have detailed descriptions. They are the names of simple mathematical functions that decide which pixels in the source image being resized contribute to the destination image.

Here is a small explaination from,
<a rel=nofollow target=_blank href="http://www.imagemagick.org/www/api/types/Enumerations.html#FilterTypes">http://www.imagemagick.org/www/api/types/Enumerations.html#FilterTypes</a>

FilterTypes is used to adjust the filter algorithm used when resizing images. Different filters experience varying degrees of success with various images and can take
sipngicantly different amounts of processing time. ImageMagick uses the LanczosFilter by default since this filter has been shown to provide the best results for
most images in a reasonable amount of time. Other filter types (e.g. TriangleFilter) may execute much faster but may show artifacts when the image is re-sized or
around diagonal lines. The only way to be sure is to test the filter with sample images.

Best regards,


>Hi Michel,
>[Question 1]
>Is there how to know the limit on Width/Height from
>memory/resource for color in advance ?
>[Question 2]
>I will use the filters for my application.
>My application needs the explanation of the filters.
>Please teach me each of the explanation of the filters.
>>Hi Yoshi,
>>For the resize transform there is no predefined limit
>>on Width/Height, but windows will have memory/resource
>>problems when they reach too high. I have seen
>>black/white graphics 20000x20000, but for color this
>>will probably be too large.
>>For the filters, the results will depend on the image
>>being resized. Some filters may look better than
>>other. The triangle and hermite filters are generally
>>not as good as the other ones but are faster.
>>Thank you for reporting the problem with the mmDrag
>>mode when both the left/right button is pressed. I
>>will look into this and correct this for the next
>>Best regards,
>>>I am Japanese and registerd user, I am not good at
>>>I am C++Builder 5 user.
>>>I have three questions.
>>>[Question 1]
>>>How big is the maximum value of the Properties Width
>>>and Height of the TResizeTransform ?
>>>[Question 2]
>>>Please teach me the meaning of the following filter
>>>types and quality order.
>>> ifTriangle ?
>>> ifHermite ?
>>> ifBell ?
>>> ifBSpline ?
>>> ifLanczos3 ?
>>> ifMitchell ?
>>>[Question 3]
>>>With the TImageScrollBox component, MouseMode
>>>property is mmDrag.
>>>When the left mouse button and the right mouse
>>>is pressed at the same time,
>>>the hand shape cursor is left grasping.
>>>Why ? Is this Bug ?

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