Question

目标：更改像素的颜色强度
代码：

using Images, ImageView;

function updateColors(path::String)
    if isfile(path)
        img = load(path);  
        chnlView = channelview(img);
        chnlView[chnlView .> 0.7] = 0.9;
        imshow(img);
    else
        info("Error: Image Not Found!");
    end
end

#By Prof.Bogumił Kamiński
function quit()
    print("Press q to quit!");
    while true
        opt = getChar();
        if opt == 'q'
            break
        else
            continue
        end
    end
end

#By Prof.Bogumił Kamiński
function getChar()
    ret = ccall(:jl_tty_set_mode, Int32, (Ptr{Cvoid},Int32), stdin.handle, true)
    ret == 0 || error("unable to switch to raw mode")
    c = read(stdin, Char)
    ccall(:jl_tty_set_mode, Int32, (Ptr{Cvoid},Int32), stdin.handle, false)
    c
end

updateColors("/opt/julia/pictures/test.jpg");
quit();

错误：

no method matching setindexshape(::Float64, ::Int64)

请帮助我解决问题！

Answer 1

您应该像这样广播分配操作：

chnlView[chnlView .> 0.7] .= 0.9

如何在Julia中更新图像像素的颜色？

1 个答案: