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I am learning flutter in most of my UI tutorial they are using this type of color code
0xfffbb448
I need to know what type is it? Where I can find these color codes? Try to find on google but not able to find which type of color code is this.
The color code 0xFFfbb448 is how you define a hexadecimal color in flutter. It starts with 0x, then 2 digits that represents the opacity/transparency, and then the last 6 digits is the color code Hex #.
You can get the 6 digit color code # from many sources such as https://htmlcolorcodes.com/ or https://www.w3schools.com/colors/colors_picker.asp
You may also find the 2 digits transparency code from sources such as https://gist.github.com/lopspower/03fb1cc0ac9f32ef38f4
An example:
Colors.blue.withopacity(0.5) would be the same as Color(0x800000FF)
where 80 means 50% opacity, and #0000FF is Hex color code for blue
There are many sources out there and similar questions like the below link to find out more.
How do I use hexadecimal color strings in Flutter?
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I want to determine area of circular object in image below using MATLAB. Can someone explain codes for doing that? I got thresholded image but I did not proceed more.
If the binary image is img, and it contains only values 0 (background) and 1 (object), or it is a logical array containing true and false, and all the object pixels are considered part of the object, then sum(img(:)) is the area of the object in pixels.
If the segmented image contains multiple objects, or noise, it will have to be filtered first to leave only the pixels that belong to the one object.
To convert the area in pixels to an area in physical units you need to know the size of a pixel. This is often obtained by adding a ruler to the image.
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I have a ply image. I want to color it according to my requirement.
1. (.ply) image from kinect
2. Change the rgb value of all point in cloud
e.g
.ply image where all points in the cloud are to be in yellow or blue color.
I have been able to display it using Matlab command "scatter3" but also want to save the colored point cloud as a new point cloud by "pcwrite" function of Matlab.
To answer properly to this question I should know which version of Matlab are you using. If you are using Matlab 2015a you should have these three function
pcread to read a 3D point cloud (.ply file);
pcshow to show a 3D point cloud;
pcwrite to write a .ply file.
Let's say your image is called "airplane.ply".
To properly use that you first read the image using:
ptCloud = pcread('airplane.ply')
then you will notice that ptCloud has different field. One of that regard the color, and is the one you have to change. To do so you have to specify a colour for each point in the cloud. So:
pointscolor=uint8(zeros(ptCloud.Count,3));
pointscolor(:,1)=255;
pointscolor(:,2)=255;
pointscolor(:,3)=51;
since [255 255 51] is the yellow color.
Then assign this matrix to the ptCloud.Color.
ptCloud.Color=pointscolor;
See the result:
pcshow(ptCloud)
and save the file:
pcwrite(ptCloud,'ptCloud.ply')
where 'ptCloud.ply' is the name you want to assign to the file.
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I'm currently working on my thesis, and one of the requirements is to put a dot just next to the page number (which is at the top right corner).
This is the code that I am using for the moment. It does everything that I want except for the dot...
\usepackage{fancyhdr}
\pagestyle{fancy}
\fancyhf{} % sets both header and footer to nothing
\renewcommand{\headrulewidth}{0pt} %Deletes the horizontal bar
\fancyhead[R]{\thepage} %puts the page number to the right
Could someone help me with my problem ?
Thank you in advance.
Use something like \hspace to \thepage:
\fancyhead[R]{\thepage \hspace{1 mm} . } %adjust 1 mm to any value as needed
Just put the dot after the \thepage;
\documentclass{article}
\usepackage{fancyhdr}
\pagestyle{fancy}
\fancyhf{}
\renewcommand{\headrulewidth}{0pt}
\fancyhead[R]{\thepage.}
\begin{document}
See the page number in the top-right corner.
\end{document}
The result:
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I am doing an image processing project. In my project there is an GUI file that reads an image and processing it for segmentation. while reading an image file, initially it is checking the size of that image... However, I don't understand what the function I=[m x n x 4] really means. Could someone explain this to me?
Your image I is of size m pixels high by n pixels wide and has 4 channels: Red, Green, Blue and an alpha channel.
Matlab stores I as a 3D array, you can access the x-y-th pixel by I(y,x,:) returning the four-vector representing the RGBA value of the x-y-th pixel.
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I know how to do simple things with images at the pixel level like applying grayscale, sepia, etc. I'd like to find some articles on how to apply saturation, hue, brightness, contrast, etc at the pixel level, and I'm having trouble getting anything useful from my google searches.
Since pixels are usually represented as RGB (red, green, blue) values, it's often more useful to convert them to another color space to manipulate them, e.g. HSB (Hue, Saturation, Brightness) - that way you can change those values individually more easily.
If you search for RGB to HSB conversion you should find examples of how to do it (I think I found some useful code on Wikipedia).
Obviously after you've manipulated the pixels (e.g. multiplying the saturations by 0.2) you then have to convert them back to RGB for display.