alpha

问题 I am trying to blend two images as shown here. This is my whole code #include <cv.h> #include <highgui.h> #include <iostream> using namespace cv; int main( int argc, char** argv ) { double beta; double input; Mat src1, src2, dst; /// Ask the user enter alpha std::cout<<" Simple Linear Blender "<<std::endl; std::cout<<"-----------------------"<<std::endl; src1 = imread("face.jpg"); src2 = imread("necklace1.png"); if( !src1.data ) { printf("Error loading src1 \n"); return -1; } if( !src2.data )

问题 I'm using .NET 4.0. I don't know if this is a framework bug or if it's a GDI+ thing. I just discovered it while writing an app to swap color channels. Let me try to explain the problem. I'm reading pixels from one bitmap, swapping the channels, and writing them out to another bitmap. (Specifically, I'm setting the output image's RGB values equal to the input image's alpha, and output's alpha equal to the input's green channel… or, to put it succinctly, A => RGB and G => A.) The code is as

问题 I want to use the following code snippet, please help me in understanding the given functions or suggest me online documentation that can I use. view.animate().setDuration(2000).alpha(0) .withEndAction(new Runnable() { @Override public void run() { list.remove(item); adapter.notifyDataSetChanged(); view.setAlpha(1); } }); what does function setDuration(2000) , .alpha(0) , .alpha(1) and . withEndAction() 回答1: setDuration(2000) sets the duration of the animation to 2000 milliseconds or 2

问题 I've created a map by overlaying polygons using spplot and with the alpha value of the fill set to 10/255 so that areas with more polygons overlapping have a more saturated color. The polygons are set to two different colors (blue and red) based on a binary variable in the attribute table. Thus, while the color saturation depends on the number of polygons overlapping, the color depends on the ratio of the blue and red classes of polygons. There is, of course, no easy built-in legend for this

问题 I have a colorplot (from imagesc) with an alpha map. I'd like the colorbar to reflect the alpha (notice that in the image below the colormaps are the same). I found solutions online but none seem to work in R2014b. Code is here: subplot(2,1,1) A = imagesc(meshgrid(0:10,0:5)); alpha(A,1) colorbar subplot(2,1,2) B = imagesc(meshgrid(0:10,0:5)); alpha(B,.7) colorbar James 回答1: You could add a textbox with alpha on top of the colorbar. This works for later versions of MATLAB. cb=colorbar

问题 I have a colorplot (from imagesc) with an alpha map. I'd like the colorbar to reflect the alpha (notice that in the image below the colormaps are the same). I found solutions online but none seem to work in R2014b. Code is here: subplot(2,1,1) A = imagesc(meshgrid(0:10,0:5)); alpha(A,1) colorbar subplot(2,1,2) B = imagesc(meshgrid(0:10,0:5)); alpha(B,.7) colorbar James 回答1: You could add a textbox with alpha on top of the colorbar. This works for later versions of MATLAB. cb=colorbar

问题 I have a colorplot (from imagesc) with an alpha map. I'd like the colorbar to reflect the alpha (notice that in the image below the colormaps are the same). I found solutions online but none seem to work in R2014b. Code is here: subplot(2,1,1) A = imagesc(meshgrid(0:10,0:5)); alpha(A,1) colorbar subplot(2,1,2) B = imagesc(meshgrid(0:10,0:5)); alpha(B,.7) colorbar James 回答1: You could add a textbox with alpha on top of the colorbar. This works for later versions of MATLAB. cb=colorbar

问题 I have tried to plot some log scale data with geom_hex() but I have a problem with alpha transparency setting. plot script; p <- ggplot(data =test,aes(x=f.log, y=d.log)) + geom_hex(aes(alpha=log(..count..)),fill="#000000")+ geom_hline(yintercept = 0, size = 0.5,color="red",linetype = 2) + geom_vline(xintercept = 0, size = 0.5,color="red",linetype = 2) + theme_bw() for log scale label correction; p +scale_y_continuous(labels =(math_format(10^.x)))+ scale_x_continuous(labels =(math_format(10^.x

问题 I have tried to plot some log scale data with geom_hex() but I have a problem with alpha transparency setting. plot script; p <- ggplot(data =test,aes(x=f.log, y=d.log)) + geom_hex(aes(alpha=log(..count..)),fill="#000000")+ geom_hline(yintercept = 0, size = 0.5,color="red",linetype = 2) + geom_vline(xintercept = 0, size = 0.5,color="red",linetype = 2) + theme_bw() for log scale label correction; p +scale_y_continuous(labels =(math_format(10^.x)))+ scale_x_continuous(labels =(math_format(10^.x

问题 This question already has answers here : UIView: opaque vs. alpha vs. opacity (2 answers) Closed 6 years ago . I want to use animation to change UIView's color to make it fade, however, somehow i can't access and set opacity, but i can set alpha. I wonder if alpha and opacity are the same? Search on the web and I didnt find a good answer. Thanks a lot for your help! 回答1: Actually "opacity" means "value of alpha-channel" of your UIView . When a view is fully opaque this means its alpha = 1 ,