For consistency use png for macos

Cargo.toml

@@ -11,8 +11,8 @@ edition = "2018"
 
 [features]
 default = ["image-data"]
-image-data = ["core-graphics", "image", "winapi/minwindef", "winapi/wingdi", "winapi/winnt"]
-wayland-data-control = ["wl-clipboard-rs"]
+image-data = ["dep:core-graphics", "dep:image", "winapi/minwindef", "winapi/wingdi", "winapi/winnt"]
+wayland-data-control = ["dep:wl-clipboard-rs"]
 
 [dependencies]
 thiserror = "1.0"
@@ -36,7 +36,7 @@ objc_id = "0.1"
 objc-foundation = "0.1"
 once_cell = "1"
 core-graphics = { version = "0.22", optional = true }
-image = { version = "0.24", optional = true, default-features = false, features = ["tiff"] }
+image = { version = "0.24", optional = true, default-features = false, features = ["png"] }
 
 [target.'cfg(all(unix, not(any(target_os="macos", target_os="android", target_os="emscripten"))))'.dependencies]
 log = "0.4"

src/platform/osx.rs

@@ -227,14 +227,14 @@ impl<'clipboard> Get<'clipboard> {
 			Some(_) | None => return Err(Error::ContentNotAvailable),
 		};
 
-		let tiff: &NSArray<NSObject> = unsafe { msg_send![obj, TIFFRepresentation] };
+		let png: &NSArray<NSObject> = unsafe { msg_send![obj, PNGRepresentation] };
 		let data = unsafe {
-			let len: usize = msg_send![tiff, length];
-			let bytes: *const u8 = msg_send![tiff, bytes];
+			let len: usize = msg_send![png, length];
+			let bytes: *const u8 = msg_send![png, bytes];
 
 			Cursor::new(std::slice::from_raw_parts(bytes, len))
 		};
-		let reader = image::io::Reader::with_format(data, image::ImageFormat::Tiff);
+		let reader = image::io::Reader::with_format(data, image::ImageFormat::Png);
 		match reader.decode() {
 			Ok(img) => {
 				let rgba = img.into_rgba8();