Android :: Apply / Convert Image From Colored To Grayscale Algorithm To Droid?
Oct 28, 2010
I am trying to use one of these algorithms to convert a RGB image to grayscale :
The lightness method averages the most prominent and least prominent colors:
(max(R, G, B) + min(R, G, B)) / 2.
The average method simply averages the values: (R + G + B) / 3.
The formula for luminosity is 0.21 R + 0.71 G + 0.07 B.
But i get very weird results ! I know there are other ways to achieve this but is it possible to do this way ?
here is the code...
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Jul 8, 2009
I have a camera application that captures a 640x480 image.I want to convert this image to grayscale.I know I have to use the setSaturatio (float sat) in the ColorMatrix method to zero but I don't know how I can set it to grayscale.
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Jul 30, 2010
I am new to this site, and I come with a question about Android.
Is there any way to convert a Bitmap to grayscale? I know how to draw a grayscale bitmap (using canvas operations: http://www.mail-archive.com/android-developers@googlegroups.com/msg38890.html) but I really need The actual bitmap in gray colors (or at least something that could be converted to a bitmap later on).
Do I have to implement it by hand (pixel by pixel operations)?
I've searched a lot, and still could not find. Anyone knows a easy/efficient way to do it?
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May 8, 2013
What I am needing is a method to get grayscale pixel data from an image or preview. I am not interested in saving the picture as a jpeg etc, just need the grayscale data.
I am aiming at API 10 (as this is the device available for testing).
On top of this, I am not having any luck getting the camera to work on the Eclipse emulator.
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Apr 27, 2010
I want to convert a image into Base64 format and send it to server. I have one Base64 class which accept byte array and return a string.I am sending image into chunks of data.I am creating creating one chunk of 100kb. If image is less than 100 kb then image is uploaded on server, but if it is greater than 100kb (i.e when it requires more than one chunk) then it will not uploaded. I think it is because I am converting image into Base64 in parts and on server it decode it only in one shot. Now I want to send a image for conversion of Base64 only in one chunk. But if image is too large then it throw OutOfMemoryException (Obviously after all it is mobile having very limeted resources).
My code is as follows:
CODE:...........
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Apr 20, 2009
I am trying to grayscale bitmap as follows, But it is crashing as soon as I run this method.
The problem is in last line. How can I assign "int" to "Color"? Or are there any better ways?
CODE:................
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May 20, 2009
I would like to convert a Bitmap to a grayscale array of bytes (one byte per pixel). At the same time I want to just crop at section from the middle. Having looked though the various api's it is not clear to me what the best way would be.
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Jul 5, 2010
I've seen this code on the web...
My questions are:
1. Is 'bmp' supposed to be the color bitmap I want to affect?
2. How do I get the 0-255 value of the grayscale?
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Dec 10, 2012
I also need to add an if conditional that makes some comparisons such as
if ( currenttime < 10:00){
... do something ...;
}
to this code
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Nov 24, 2009
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Oct 7, 2012
I am wondering how do I go about writing code (or be directed to any existing relevant code), that allows me to average the grayscale values above a threshold (Otsu threshold) from a JPEG photo taken from an android device camera.
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