image scaling[solved]

Is there an "easy" way to scale an jpg image??

Yes

@broadblues

Nice, any more hints/examples or something usefull for me?

Well your question was a bit vague.

If you just want to scale a random image to sen by email or something , then I would, (assuming you have SketchBlock installed, with ProAction and PIL)

start SketchBlock

Choose import from the project menu and select your jpg file.

The choose Scale Image from the "Image" menu and anter the new size in the window that pops up.

The choose Export AS from the Project menu and choose JPG from the list of files, and choose your outpur file.

Or use ImageFX

Or what did you really want to do?

[edit]
So poking arround in the forum index I can see that this is the developement forum so you likely want to do this as a program. How do you tell the forums apart, when if you look at the forum title they just sau "AmigaOS4" ?

If it really is a dev question, then a bit more context would be useful.... what do you want to do with this image once scaled? What sort of prgram are you aiming for?

[/edit]

Programmatically, the easiest way would be to load the JPEG using datatypes, and call PDTM_SCALE on it.

But it really depends exactly what you are trying to achieve.

Ok, i'll try to be a bit more precise.

I have image. All images are the same size. But i want to be able to either click on the image or hold the mouse over it. And then scale it say twice the size. I'm thinking of scaling it and to put it on a new window.Working with c offcourse.

Reaction GUI?

Load it into a bitmap.image and scale it, that handles all the datatypes stuff for you.

Have alook at my SnakeEyes program, it;s in python but it fdoes all the display via ReAction GUI (using ProAction but ProAction uses all the same tags etc as C)



Otherwise a little bit more detail required

I'm using reaction yes.

Been thinking a bit more.
I need to duplicate the image,since i need the original as it is. And then i need to resize the copy. Is composite a good thing to use? Ain't that using hw acceleration? Is there any good docs and maybe examples to using that? Speed is a nice thing i believe. Fastest way to duplicate the image aswell.

@Antique
Finnaly got my head together and found the solution. Thansk to broadblues fot the help.

@broadblues

How did you get that IA_Left and IA_Top stuff working with BitMap class object ? RethinkLayout() has no effect. DoMethod(WinObj,WM_RETHINK) does strange effects when used after NEWSIZE message. What is RETHINKGUIWINDOW command you're using ?

@TSK

Quote:

I set "LAYOUT_NoLayout,1," in the parent layout of the image.

That means I have to layout the image manually, so I can set the aspect ratio etc the way I like.

Check the function ReLayoutImage() for how I did that.


RETHINKGUIWINDOW is a Wrapper for

IIntuition->IDoMethod(gui->gui_WinObj,WM_RETHINK,NULL);