grayscale

This is my function, I am using the headers BMP according to wikipedia BITMAPINFOHEADER. But, I am getting a file without any image...when putting padding, the process stops. // Structures for header info #pragma pack(push,1) /* Windows 3.x bitmap file header */ typedef struct { char filetype[2]; /* magic - always 'B' 'M' */ unsigned int filesize; short reserved1; short reserved2; unsigned int dataoffset; /* offset in bytes to actual bitmap data */ } file_header; /* Windows 3.x bitmap full header, including file header */ typedef struct { file_header fileheader; unsigned int headersize; int

This question already has an answer here: How to convert RGB images to grayscale in matlab without using rgb2gray 2 answers I want convert my color image to grayscale and avoid to use rgb2gray command. Dan So then: I_grey = mean(I_colour, 3); It's possible you then might need to cast it to a uint8 before you can view it: I_grey = uint8(mean(I_colour, 3)); Or if you want to be really accurate you should actually be finding a weighted average. See the answer to this question for weighting options: Formula to determine brightness of RGB color Here is an example of this: W = permute([0.3086, 0

What I am trying to do, is to take a photo using a camera intent, retrieve and convert said photo to a grayscale byte array (note: I am not interested in getting a grayscale image, just need the byte data). Then finally, apply a threshold and average all the pixels above the threshold. The relevant snippet of code is: @Override public void onClick(View v) { Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri); startActivityForResult(intent, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE); } }); } @Override protected void

I want to apply the grayscale effect to image using NDK. For that i have googled a lot but found the same result which returns the image in somewhat like negative(this is what i believe). What i want :: For example :: I have this original image After applying the grayscale effect it should be like this :: What i have tried :: I want to achieve this functionality using NDK,so that i have created one function in .cpp file JNIEXPORT void JNICALL Java_com_example_ndksampleproject_MainActivity_jniConvertToGray(JNIEnv * env, jobject obj, jobject bitmapcolor,jobject bitmapgray) { AndroidBitmapInfo