grayscale

问题 am trying to convert a grayscale image to a byte array. I use the following code. however, the byte array generated is not of the logical size. ImageConverter converter = new ImageConverter(); byte[] test = (byte[])converter.ConvertTo(gpuMatch.Bitmap,typeof(byte[])); the image is a grayscale 792x410 8 bit depth. so should'nt the array size be 324720 bytes? i am getting something close to 140122 elements in the byte array. ImageConverter ic = new ImageConverter(); Image img = (Image)ic

问题 Hello, maybe this question looks stupid, but I try to use Pillows Image.convert() to convert an image to grayscale. This image I have stored in a variable img because I already pre-processed it, but not with Pillow (type: numpy.ndarray). So I type: img = Image.convert('LA') But it does not seem to work, as it says: AttributeError: module 'PIL.Image' has no attribute 'convert' If I type img = Image.open("picture.jpg").convert('LA') it works, but I want to use it on a variable that already

问题 I looked for how to read a Bmp file into a 2 or 1 dimensional Array under C , there are many solutions but not the one i need. I need to read the Black and white bmp into (to beginn) 2 dimensional array which have to contain values from 0 to 255 (greyscale) and then transform it to 1 dimensional array(but that's not a problem). Matlab does this automticly but i want to be more autonomous working under C/C++ at the end the bmp shall be saved into a Postgre Database int array. Thanks 回答1: There

问题 I looked for how to read a Bmp file into a 2 or 1 dimensional Array under C , there are many solutions but not the one i need. I need to read the Black and white bmp into (to beginn) 2 dimensional array which have to contain values from 0 to 255 (greyscale) and then transform it to 1 dimensional array(but that's not a problem). Matlab does this automticly but i want to be more autonomous working under C/C++ at the end the bmp shall be saved into a Postgre Database int array. Thanks 回答1: There

问题 I get from a camera greyscale values for each pixel in the format 23453... (16 bit values) And I set the pixelcolor for my .bmp with image.SetPixel(cols, rows, color); but how can I get my greyscale value into a correct color value? So the picture can be correct be displayed in grayscalevalues? thanks 回答1: public static Bitmap getGrayscale(Bitmap hc){ Bitmap result = new Bitmap(hc.Width, hc.Height); ColorMatrix colorMatrix = new ColorMatrix(new float[][]{ new float[]{0.5f,0.5f,0.5f,0,0}, new

问题 I have been having difficulty trying to generate a histogram for a 640x480 grayscale image I am working with. I am using Python 2.7.3, OpenCV 2.4.6 (Python bindings) and Numpy The image below was generated from the same image, using an executable software tool (programmed in C++) The properties for this histogram were: bins = 50 hist_width = 250 normalised_height_max = 50 The image specs are therefore 250x50 I have consulted this documentation: Histogram Calculation in OpenCV http://docs

问题 I have been having difficulty trying to generate a histogram for a 640x480 grayscale image I am working with. I am using Python 2.7.3, OpenCV 2.4.6 (Python bindings) and Numpy The image below was generated from the same image, using an executable software tool (programmed in C++) The properties for this histogram were: bins = 50 hist_width = 250 normalised_height_max = 50 The image specs are therefore 250x50 I have consulted this documentation: Histogram Calculation in OpenCV http://docs

问题 I am trying to convert an png Gray scale image to RGB png image using the following command. convert HopeLoveJoy.png -size 1x1 -fill "rgba(0%,1%,2%,0)" -draw "color 511,511 point" out_test.png By using the above the above command I am able to convert but the color of the image is getting changed. Is any thing wrong in the command?? Any help is appreciated. Thanks in advance. 回答1: If, as your question title implies, you really just want to go from greyscale to sRGB colorspace, use this:

问题 I am trying to convert an png Gray scale image to RGB png image using the following command. convert HopeLoveJoy.png -size 1x1 -fill "rgba(0%,1%,2%,0)" -draw "color 511,511 point" out_test.png By using the above the above command I am able to convert but the color of the image is getting changed. Is any thing wrong in the command?? Any help is appreciated. Thanks in advance. 回答1: If, as your question title implies, you really just want to go from greyscale to sRGB colorspace, use this:

问题 I am trying to convert an png Gray scale image to RGB png image using the following command. convert HopeLoveJoy.png -size 1x1 -fill "rgba(0%,1%,2%,0)" -draw "color 511,511 point" out_test.png By using the above the above command I am able to convert but the color of the image is getting changed. Is any thing wrong in the command?? Any help is appreciated. Thanks in advance. 回答1: If, as your question title implies, you really just want to go from greyscale to sRGB colorspace, use this: