Rotate image with stretchblt

Rotate image with stretchblt

Post by Michael Koo » Sun, 29 Jun 2003 17:32:38


Hello,
I like to rotate an image with 90, 180, 270 degrees
and I've heard that it should be possible with stretchblt.
Does anybody have an example ?
many thanks
Michael

 
 
 

Rotate image with stretchblt

Post by Ma?l H?r » Sun, 29 Jun 2003 21:19:12


A google search returned the following interesting articles, there is also a
faster method using Scanline:

( the following should be entered in one row )
http://groups.google.de/groups?q=rotate+stretchblt+group:borland.publ...
hi.*&hl=de&lr=&ie=UTF-8&group=borland.public.delphi.*&selm=3cec7df8_2%40dnew
s&rnum=1

( the following should be entered in one row )
http://groups.google.de/groups?q=rotate+stretchblt+group:borland.publ...
hi.*&hl=de&lr=&ie=UTF-8&group=borland.public.delphi.*&selm=35AFA781.3584%40m
ath.okstate.edu&rnum=7



Quote:> Hello,
> I like to rotate an image with 90, 180, 270 degrees
> and I've heard that it should be possible with stretchblt.
> Does anybody have an example ?
> many thanks
> Michael


 
 
 

Rotate image with stretchblt

Post by Michael Koo » Mon, 30 Jun 2003 01:02:27


many thanks,
I think this will be the right solution...
best regards
Michael Koop

"Ma?l H?rz" schrieb:

> A google search returned the following interesting articles, there is also a
> faster method using Scanline:

> ( the following should be entered in one row )
> http://groups.google.de/groups?q=rotate+stretchblt+group:borland.publ...
> hi.*&hl=de&lr=&ie=UTF-8&group=borland.public.delphi.*&selm=3cec7df8_2%40dnew
> s&rnum=1

> ( the following should be entered in one row )
> http://groups.google.de/groups?q=rotate+stretchblt+group:borland.publ...
> hi.*&hl=de&lr=&ie=UTF-8&group=borland.public.delphi.*&selm=35AFA781.3584%40m
> ath.okstate.edu&rnum=7



> > Hello,
> > I like to rotate an image with 90, 180, 270 degrees
> > and I've heard that it should be possible with stretchblt.
> > Does anybody have an example ?
> > many thanks
> > Michael

 
 
 

1. Rotating the image blurs the image

I've wanted to rotate a few images lately (Image>Rotate) but the image
becomes noticeably less sharp after the rotation.

One of the current Challenge photos, ep-12 (restaurant), is a good
example. I had wanted to rotate it as part of my repair so that the
chimney was vertical. But the image was just too unsharpened after the
rotation to use it.

For comparison I've rotated the same image in Photoshop by the same
amount (I think I used 2 degrees) and there was no change in
sharpness.

Is this a shortcoming in PSP or is there some trick to using Rotate?

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