Using GR (for the image display) should be fast enough:
using TestImages
using GR
img = testimage("cameraman")
intensities = reshape(reshape(float(img.data[:]), 512, 512)
for i in 1:10
tic(); imshow(intensities, colormap=GR.COLORMAP_GRAY); toc()
end
% julia img.jl
elapsed time: 1.190862896 seconds
elapsed time: 0.007231715 seconds
elapsed time: 0.013265573 seconds
elapsed time: 0.00677057 seconds
elapsed time: 0.012534283 seconds
elapsed time: 0.010761427 seconds
elapsed time: 0.00731559 seconds
elapsed time: 0.009606974 seconds
elapsed time: 0.007050752 seconds
elapsed time: 0.008927604 seconds
The first call is slower because the window has to be set up.
<https://lh3.googleusercontent.com/-zQycjhhjJ18/WBDE96L9QMI/AAAAAAAAAEM/CREbbuO_3qcy8x9MhqqTGCmvwwUxqGEGACLcB/s1600/img.png>
On Sunday, October 16, 2016 at 6:45:00 PM UTC+2, Paul B. wrote:
>
> Hello, all. Starting out with Julia.
>
> I need to display some pseudo-color images so I'm playing around with the
> ImageView package. It seems to be running very slowly. Displaying one of
> the images from TestImages can take nearly a minute:
> img = testimage( "cameraman" )
> Gray Images.Image with:
> data: 512×512 Array{ColorTypes.Gray{FixedPointNumbers.UFixed{UInt8,8}},2
> }
> properties:
> colorspace: Gray
> spatialorder: x y
>
> julia> tic(); ImageView.view( img ); toc();
> elapsed time: 50.552471225 seconds
> Zooming and other interaction with the mouse is similarly sluggish.
>
> I didn't expect this for a 512x512 grayscale image. I am running Julia
> version 0.5.1-pre+2 and ImageView is running into some issues with
> deprecated functionality and namespace conflicts. However, the above did
> not generate any warnings at all but still took 50 seconds to display.
> This is all under Linux. Any ideas why this is happening or if I could be
> doing something wrong?
>
