pixel

问题 Let say I have this rose (Do not care about the background, only the white leaves are important). I transform it to a grayscale picture: grayscaled=cv2.imread('white_rose.png',cv2.IMREAD_GRAYSCALE) How can I change every white pixel to a red one under the condition the red color ( R=255 ) will have the same contrast as the white one has ? Meaning I want to see the white leaves in red color but with the same L value of every pixel that in grayscaled ? 回答1: You need to loop over your grey image

问题 Let say I have this rose (Do not care about the background, only the white leaves are important). I transform it to a grayscale picture: grayscaled=cv2.imread('white_rose.png',cv2.IMREAD_GRAYSCALE) How can I change every white pixel to a red one under the condition the red color ( R=255 ) will have the same contrast as the white one has ? Meaning I want to see the white leaves in red color but with the same L value of every pixel that in grayscaled ? 回答1: You need to loop over your grey image

问题 So I am using Pixels in my Leaflet using crs: L.CRS.Simple and unproject in all the places I reference coordinates, it is working great. However I am now trying to add a search bar and there is one line that I cannot figure out how to make it use pixels instead of LatLng (it's pulling pixel coords from a file) var title = data.newsroom, //value searched loc = [data.latitude, data.longitude] //position found marker = new L.Marker(new L.latLng(loc), {title: title, icon:icon} );//se property

问题 I have this code: from PIL import Image import numpy as np img = Image.open('img.jpg') Image.fromarray(np.array([[np.mean(i, axis=1).astype(int).tolist()]*len(i) for i in np.array(img).tolist()]).astype('uint8')).show() And I am trying to modify the pixels of the image in PIL, however when I run it it gives an error as follows: KeyError: ((1, 1, 1280), '|u1') Not just that, it also outputs a second error as follows: TypeError: Cannot handle this data type Is there a way to overcome this? P.S.

问题 I'm curious to how I would display pixel art for my game. For now i'm just resizing the SKScene to be sceneWithSize:CGSizeMake(256, 192) is this the correct way or is there a bester way to go about doing this sort of task? 回答1: First, use the default sizes of scenes - you do not need to scale or change their sizes, this is just bad. Next just scale your sprites either beforehand (in Photoshop for example) using nearest neighbor scale method - this keeps pixels separate and does not introduce

问题 I'm curious to how I would display pixel art for my game. For now i'm just resizing the SKScene to be sceneWithSize:CGSizeMake(256, 192) is this the correct way or is there a bester way to go about doing this sort of task? 回答1: First, use the default sizes of scenes - you do not need to scale or change their sizes, this is just bad. Next just scale your sprites either beforehand (in Photoshop for example) using nearest neighbor scale method - this keeps pixels separate and does not introduce

问题 Refering to the example on the Documentation for Gtkmms GdkRGB: #include <gtk/gtk.h> #define IMAGE_WIDTH 256 #define IMAGE_HEIGHT 256 guchar rgbbuf[IMAGE_WIDTH * IMAGE_HEIGHT * 3]; gboolean on_darea_expose (GtkWidget *widget, GdkEventExpose *event, gpointer user_data); int main (int argc, char *argv[]) { GtkWidget *window, *darea; gint x, y; guchar *pos; gtk_init (&argc, &argv); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); darea = gtk_drawing_area_new (); gtk_widget_set_size_request (darea,

问题 I'm using google maps in my application, and I have a webserver with a databse filled with lat/lon values. I want to mark them on the map, but I also want to cluster them together if they are within a certain pixel-distance of eachother. I figure if I retrieve all my points from the database, I should be able to do something like this (pseudocode): clusters[]; while(count(points)) { cluster[]; point = points.pop(); boundingbox = pixelsToBB(point, pixeldistance, zoomlevel); query = "select *

问题 I'm using google maps in my application, and I have a webserver with a databse filled with lat/lon values. I want to mark them on the map, but I also want to cluster them together if they are within a certain pixel-distance of eachother. I figure if I retrieve all my points from the database, I should be able to do something like this (pseudocode): clusters[]; while(count(points)) { cluster[]; point = points.pop(); boundingbox = pixelsToBB(point, pixeldistance, zoomlevel); query = "select *

问题 I would like to fade the color of a pixel out toward white, but obviously maintain the same color. If I have a pixel (200,120,40) , will adding 10 to each value to make (210,130,50) make it the same color, just lighter, or will it change the color entirely? For example, I know that (100,100,100) going to (110,110,110) is a greyscale fade. I would like the same with RGB values and I would like to do it numerically, as indicated. Is there an equation to do so? 回答1: There are a bunch of ways to