I have an array storing pressure coefficient values for each triangular face from a 3D geometry, and I am trying to obtain the RGB index values from a jet colormap based on the min and max from this array. I have done this on Matlab like this where cvar is the array storing the values. How can I achieve this
Tag: rgb
Can RGB and RGBA be converted to each other?
I have a RGB image, and I want to convert it to RGBA to get alpha channels. It’s likely to convert RGB to HSV to get V channel. but now i want to get Alpha channel from RGBA. Can RGB and RGBA be converted to each other? Answer RGB represented in RBGA is just the same RGB values with A=max.
How to save a full size image with RGB and float32?
I have an image array with RGB, np.float32, and values in the range of 0 … 1. When I multiply the array with 255, and use cv2.imwrite, the output is not correct. When I use plt.imshow(img.astype(np.float32)), the output is right, but the image size is too small. How can I output a good image? Answer The…
Generate random colors (RGB)
I just picked up image processing in python this past week at the suggestion of a friend to generate patterns of random colors. I found this piece of script online that generates a wide array of different colors across the RGB spectrum. I am simply interesting in appending this script to only generate one of …
cvtcolor in Cv2 – no attribute
I’m writing a program to collect a series of images from a USB microscope and generate an average as a way of denoising. I’m having to convert the image into a numpy array, sum the pixels then divide before converting back to an image. Somewhere along the line the channels get mixed so my output i…
PIL’s colour space conversion YCbCr -> RGB
The algorithm used by PIL v1.1.7 gives ‘washed out’ looking results. When converting the same source data using ffmpeg it looks correct. Using mplayer gives identical results to ffmpeg (perhaps they use the same library underneath). This leads me to believe PIL may be stuffing up the colour space …
How to read the RGB value of a given pixel in Python?
If I open an image with open(“image.jpg”), how can I get the RGB values of a pixel assuming I have the coordinates of the pixel? Then, how can I do the reverse of this? Starting with a blank graphic, ‘write’ a pixel with a certain RGB value? I would prefer if I didn’t have to dow…