DZone Snippets: resize code

Simple Resize PIL Image with python

manatlan (manatlan) — Thu, 17 Jul 2008 09:48:29 GMT

// description of your code here



def resize(im,percent):

    """ retaille suivant un pourcentage 'percent' """

    w,h = im.size

    return im.resize(((percent*w)/100,(percent*h)/100))



def resize2(im,pixels):

    """ retaille le coté le plus long en 'pixels' 

        (pour tenir dans une frame de pixels x pixels)

    """

    (wx,wy) = im.size

    rx=1.0*wx/pixels

    ry=1.0*wy/pixels

    if rx>ry:

        rr=rx

    else:

        rr=ry



    return im.resize((int(wx/rr), int(wy/rr)))

Howto resize multiple pictures, graphics, images

Tue, 29 Apr 2008 16:41:33 GMT



for k in $(ls *.jpg); do convert -resize 800 -quality 80 $k r800-$k; done

Batch re-size a collection of images from the command line

27stars (27stars) — Tue, 01 Apr 2008 09:33:24 GMT



for img in $(ls *.png); do convert $img -resize 75% smaller-$img; done;

C#: Resize An Image While Maintaining Aspect Ratio and Maximum Height

cornerblue (CornerBLUE, Inc.) — Thu, 19 Jul 2007 22:55:39 GMT

// This allows us to resize the image. It prevents skewed images and
// also vertically long images caused by trying to maintain the aspect
// ratio on images who's height is larger than their width



public void ResizeImage(string OriginalFile, string NewFile, int NewWidth, int MaxHeight, bool OnlyResizeIfWider)

{

	System.Drawing.Image FullsizeImage = System.Drawing.Image.FromFile(OriginalFile);



	// Prevent using images internal thumbnail

	FullsizeImage.RotateFlip(System.Drawing.RotateFlipType.Rotate180FlipNone);

	FullsizeImage.RotateFlip(System.Drawing.RotateFlipType.Rotate180FlipNone);



	if (OnlyResizeIfWider)

	{

		if (FullsizeImage.Width <= NewWidth)

		{

			NewWidth = FullsizeImage.Width;

		}

	}



	int NewHeight = FullsizeImage.Height * NewWidth / FullsizeImage.Width;

	if (NewHeight > MaxHeight)

	{

		// Resize with height instead

		NewWidth = FullsizeImage.Width * MaxHeight / FullsizeImage.Height;

		NewHeight = MaxHeight;

	}



	System.Drawing.Image NewImage = FullsizeImage.GetThumbnailImage(NewWidth, NewHeight, null, IntPtr.Zero);



	// Clear handle to original file so that we can overwrite it if necessary

	FullsizeImage.Dispose();



	// Save resized picture

	NewImage.Save(NewFile);

}

Image/canvas bliting

korakot (Korakot Chaovavanich) — Thu, 01 Dec 2005 20:57:55 GMT

I can't remember how to call the blit method.
So, here's just a personal reminder.
(BTW, the pys60 doc has a wrong order between target and source)



app.body = c = Canvas()

w,h = 20,20

im = Image.new(size=(w,h))



# here's prototype

# blit(im, source=(0,0,w,h), target=(0,0), mask=None, scale=0)

# here are examples

c.blit(im)  # put entire image on top-left

c.blit(im, target=(70,70)) # put it about mid-screen

c.blit(im, (0,0,w/2,h/2))  # put a quater image on top-left



# double the image size and put it about mid-screen

c.blit(im, target=(60,60,100,100), scale=1)

If scale is not specified and source <> target, the image
will be clipped instead of resized.

mask is a 1-bit image with the same size as image.
mask = Image.new((w,h),'1')
Pixel on the image will be copied if the same pixel
on the mask is 'white'.
So we can use mask to make 'Sprite'.

Readable, resizable font in stylesheet

korakot (Korakot Chaovavanich) — Thu, 06 Oct 2005 00:52:12 GMT



body, td {font:90% Tahoma, [other fonts]}

Today I found an apps where its Thai font is ugly.
I added this 90% Tahoma to its font style.
Don't use pixel (px). It's unresizable (unless using FF).

Drag and Drop image with javascript

korakot (Korakot Chaovavanich) — Wed, 27 Jul 2005 17:10:02 GMT

You can make the image resizable (using shift-drag) by



SET_DHTML("name1"+RESIZABLE) // any size

SET_DHTML("name1"+SCALABLE) // keep aspect ratio

See more detail here
http://www.walterzorn.com/dragdrop/dragdrop_e.htm