I have a table like this one: https://docs.google.com/spreadsheets/d/1Kn4vfbHwpif7u-6ZTznFpBJFNHhnStETPIQVyQq8xgY/edit#gid=0 with bottom / top color and the Red, Green, Blue (RGB) of the result (where it states 'Preparation' for the bottom color means the canvas so essentially its the RGB of the top color - those rows are the 'single colors').
I am looking for a relation between the double colors and the single colors. E.g. could I somehow subtract one color from their combination and get the other? Either by using the RGB values or using the images in some software?
Note that the type/formula/function/relation that I am looking for will be only for specific single colors and their combinations which I have already measured (do not care if it is valid beyond the dataset that I am working with)
I created a custom venn chart for two sets an their intersection in JavaFX.
Now I want to show the number of elements in this sets like in the following picture:
The sets are ellipses and I used masks to give the intersection a different color.
Now I want to show the number with size and position related to the available space so that the numbers are always inside the according area.
The width for the text element is easy to calculate, but I don't know how to get available height for the text elements.
Maybe it could be helpful to have the pixels of the ellipses as path, but I have no idea to how I can get this.
Does anyone know how to implement that?
Edit:
I developed an algorithm to find the size of a rectangle, which fits in the required areas of the ellipses. The text are scaled to the size of the rectangle and it works, but now I have another problem.
I need to center the scaled text in the rectangle an I used a StackPane for that. But I can't position the StackPane in the chart parent. If I set the layoutX and layoutY the bounds in parent are different.
For example: stackPane with text = sp;
sp.setLayoutY(122.1662320906945);
The Result for getBoundsInParent().getMinY() is 97.16622924804688;
How can I set the StackPane position, if I use it in a chart class as chart children?
I have two boxes filled with colors, a green one on the left, and gray one on the right. They go right up against each other in the middle of the screen, and I would like each one to extend the width of the browser, so the green one extends all the way to the left, and the gray one extends all the way to the right, no matter how wide the browser gets. How can I do this?
the width property supports percentage values, which are relative to the size of the window it exists in.
See:
http://learnlayout.com/percent.html
http://www.w3schools.com/cssref/pr_dim_width.asp
I wrote a program that periodically outputs KML files. These files contain a grid of polygons, always with the same spatial coverage. I want to use the polygon's fill color to represent a data values for each grid cell. I know how to set the fill color of the polygon with the Style tag. Is it possible to change to polygons color over time using the TimeStamp or TimeInterval? If not, is there a way to hide an "old" polygon and draw a "new" polygon at the same location, but with a different color? Is there a better way to represent a grid that has data value for each cell, like a Ground Overlay?
For changing the polygon color, you need to use 3rd party kml parsers like geoxml3.
see this,
changing the color of Polygons from KML rendered using geoxml3 on mouseover
I have more then 1 week reading about selective color change of an image. It meand selcting a color from a color picker and then select a part of image in which I want to change the color and apply the changing of color form original color to color of color picker.
E.g. if I select a blue color in color picker and I also select a red part in the image I should be able to change red color to blue color in all the image.
Another example. If I have an image with red apples and oranges and if I select an apple on the image and a blue color in the color picket, then all apples should be changing the color from red to blue.
I have some ideas but of course I need something more concrete on how to do this
Thank you for reading
As a starting point, consider clustering the colors of your image. If you don't know how many clusters you want, then you will need methods to determine whether to merge or not two given clusters. For the moment, let us suppose that we know that number. For example, given the following image at left, I mapped its colors to 3 clusters, which have the mean colors as shown in the middle, and representing each cluster by its mean color gives the figure at right.
With the output at right, now what you need is a method to replace colors. Suppose the user clicks (a single point) somewhere in your image, then you know the positions in the original image that you will need to modify. For the next image, the user (me) clicked on a point that is contained by the "orange" cluster. Then he clicked on some blue hue. From that, you make a mask representing the points in the "orange" cluster and play with that. I considered a simple gaussian filter followed by a flat dilation 3x5. Then you replace the hues in the original image according to the produced mask (after the low pass filtering, the values on it are also considered as a alpha value for compositing the images).
Not perfect at all, but you could have a better clustering than me and also a much-less-primitive color replacement method. I intentionally skipped the details about clustering method, color space, and others, because I used only basic k-means on RGB without any pre-processing of the input. So you can consider the results above as a baseline for anything else you can do.
Given the image, a selected color, and a target new color - you can't do much that isn't ugly. You also need a range, some amount of variation in color, so you can say one pixel's color is "close enough" while another is clearly "different".
First step of processing: You create a mask image, which is grayscale and varying from 0.0 to 1.0 (or from zero to some maximum value we'll treat as 1.0), and the same size as the input image. For each input pixel, test if its color is sufficiently near the selected color. If it's "the same" or "close enough" put 1.0 in the mask. If it's different, put 0.0. If is sorta borderline, put an in-between value. Exactly how to do this depends on the details of the image.
This might work best in LAB space, and testing for sameness according to the angle of the A,B coordinates relative to their origin.
Once you have the mask, put it aside. Now color-transform the whole image. This might be best done in HSV space. Don't touch the V channel. Add a constant to S, modulo 360deg (or mod 256, if S is stored as bytes) and multiply S by a constant chosen so that the coordinates in HSV corresponding to the selected color is moved to the HSV coordinates for the target color. Convert the transformed S and H, with the unchanged L, back to RGB.
Finally, use the mask to blend the original image with the color-transformed one. Apply this to each channel - red, green, blue:
output = (1-mask)*original + mask*transformed
If you're doing it all in byte arrays, 0 is 0.0 and 255 is 1.0, and be careful of overflow and signed/unsigned problems.