wasn't the layout. It was the colors being bound between 0-1 instead of 255 like I was expecting

resources/shaders/simple_texture.fragment

@@ -6,7 +6,7 @@ layout(set = 0, binding = 1, rgba8ui) readonly uniform uimage2D img;
 void main() {
 
     vec2 onePixel = vec2(1.0, 1.0) / (720.0, 756.0);
-    vec2 pos = tex_coords + onePixel * vec2(0, 0);
+    vec2 pos = tex_coords * onePixel;
     ivec2 ipos = ivec2(pos);
     vec4 colorSum = imageLoad(img, ipos);
     f_color = colorSum;
@@ -15,5 +15,13 @@ void main() {
    // f_color = texture(tex, tex_coords);
    // ivec2 t = ivec2(tex_coords.x, tex_coords.y );
 
+    ivec2 size = ivec2(gl_FragCoord.x, gl_FragCoord.y);
+    //ivec2 size = ivec2(0, 0);
+
+    f_color = imageLoad(img, size) / (200);
+//    f_color.w = 0;
+//    f_color.r = 75;
+//    f_color.g = 30;
+//    f_color.b =;
 
 }

src/main.rs

@@ -44,6 +44,7 @@ use shaderc::CompileOptions;
 use shade_runner::CompileError;
 use crate::workpiece::{WorkpieceLoader, Workpiece};
 use winit::{EventsLoop, WindowBuilder, WindowEvent, Event};
+use winit::dpi::LogicalSize;
 use vulkano_win::VkSurfaceBuild;
 
 
@@ -67,6 +68,7 @@ fn main() {
 
     let mut events_loop = EventsLoop::new();
     let mut surface = WindowBuilder::new()
+        .with_dimensions(LogicalSize::from((800, 800)))
         .build_vk_surface(&events_loop, instance.clone()).unwrap();
     let mut window = surface.window();