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Published on 2010-04-24T09:33:34Z
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2010/04/24
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Hi,
I am using C#, and having an image stored in the object Bitmap.
Now I would like to convert this image into 8bit greyscale, then into a 4-bit greyscale image.
Do you have any tips how this can be made?
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From the documentation of Image.FromHbitmap() at http://msdn.microsoft.com/en-us/library/k061we7x%28VS.80%29.aspx :
The FromHbitmap method makes a copy of the GDI bitmap; so you can release the incoming GDI bitmap using the GDIDeleteObject method immediately after creating the new Image.
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A method to look for a small Bitmap that is contained inside a bigger Bitmap.
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Let's say I get a HBITMAP object/handle from a native Windows function. I can convert it to a managed bitmap using Bitmap.FromHbitmap(nativeHBitmap), but if the native image has transparency information (alpha channel), it is lost by this conversion.
There are a few questions on Stack Overflow regarding…
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i know that there must be a simpler way of doing this, i just don't understand how java works well enough, and i am struggling. could someone perhaps point me in the right direction?
ImageButton image = (ImageButton) findViewById(R.id.card1);
ImageButton image2 = (ImageButton) findViewById(R…
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Hi!
How can I determine/calculate the byte size of a bitmap (after decoding with BitmapFactory)?
I need to know how much memory space it occupies, because I'm doing memory caching/management in my app. (file size is not enough, since these are jpg/png files)
Thanks for any solutions!
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