Legacy ImageMagick Discussions Archive

snibgo wrote: 2019-01-09T02:32:38-07:00

rohitlal wrote:Unhandled exception

I suggest you include an error handler, and print the exception error message it gives.

I tried to put the whole code in try catch statements but still not able to catch that exception.
Sorry for novice questions, but i'm new to c++.

Can anyone please guide me, how do I write a grayscale image in single channel in IM 7+ version.

I've tried But, couldn't get final image as single channel image.

... the program doesn't runs well & throws error.
What goes wrong? What is the error message?


Error Message : Unhandled exception at 0x00007FFAEF063A7B (CORE_RL_MagickCore_.dll) in GrablinkSnapshot.exe: 0xC0000005: Access violation reading location 0x000001DB381B0000.

Please tell me where I ...

snibgo wrote: 2019-01-08T08:24:03-07:00 What version of IM?

Perhaps your quantized image has only 16 shades of gray.

IM version : 7.0.8-23 Q16 x64 2019-01-02

My image in pixel data is 8-bit grayscale image. But, magick++ is writing it as 4-bit image from the above code. Please tell me where I'm going wrong.

I'm reading image from the pixel data :


image.read(4096,4096, "R", CharPixel, pixelDataPointer);
image.write("my_image.bmp");


and it works fine.

But, when I use "LongPixel" , the program doesn't runs well & throws error.


image.read(4096,4096, "R", LongPixel, pixelDataPointer);
image ...

I'm generating an image from the Pixel data array in magick++ :

image.read(4096,4096, "R", CharPixel, pixelArrayPointer);
image.read(4096,4096, "G", CharPixel, pixelArrayPointer);
image.read(4096,4096, "B", CharPixel, pixelArrayPointer);


Then, converting it to grayscale :


image ...