Displaying .tiff or .tif images in Julia through QML.jl

Moeasy64 · May 17, 2024, 12:20pm

Good morning, I am trying to display a .tiff image inside my qml application through qml.jl. I’ve seen there’s a way through third party bundles to display such image type. Anyway I can’t figure out how to do it with Julia. is there a way?

kimikage · May 17, 2024, 10:45pm

Welcome to Julia Discourse.

I am not familiar with QML.jl (or Qt), but README.md explains the basic usage.

Images, i.e., arrays of colors, could be displayed with display() (via PNG). Images.jl is a collection of packages related to image processing. You could get an array of colors with img = load("image.tiff").

github.com

barche/QmlJuliaExamples/blob/master/images/image.jl

using Test
using QML
using Images # for show of png
using TestImages

function test_display(d::JuliaDisplay)
  img = testimage("mandril_color")
  display(d, img)
end
@qmlfunction test_display

loadqml(joinpath(dirname(@__FILE__), "qml", "image.qml"))


# Run the application
exec()

Also, if you convert the color type to ARGB32 (e.g., ARGB32.(img)), you should be able to use JuliaCanvas.

github.com

barche/QmlJuliaExamples/blob/master/images/threadedcanvas.jl

ENV["QSG_RENDER_LOOP"] = "basic"

using Test
using QML
using Images
using CxxWrap

const img = zeros(ARGB32,512,512)

function circle!(img,r)
    width,height = size(img)
    ox = width/2
    oy = height/2
	
    for x in 1:width
        for y in 1:height
            if (x-ox)^2 + (y-oy)^2 < r^2
                img[x,y] = ARGB32(0.3, 0.3, 1, 1)
            else
                img[x,y] = ARGB32(0,0,0,1)

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There are many variations of TIFFs, so your TIFF files might not appear as you expect. If you run into problems with reading TIFFs, you may want to create a separate question topic.