diff --git a/public/js/crop_editor.js b/public/js/crop_editor.js
index 043d064..770445a 100644
--- a/public/js/crop_editor.js
+++ b/public/js/crop_editor.js
@@ -87,48 +87,52 @@ class CropEditor {
 		this.image_container.appendChild(this.original_image);
 	}
 
-	setInputValues() {
+	setDefaultCrop(cropAspectRatio, cropMethod) {
+		let source = this.original_image;
+		let sourceAspectRatio = source.naturalWidth / source.naturalHeight;
+
+		// Cropping from the centre?
+		if (cropMethod === "c") {
+			// Crop vertically from the centre, using the entire width.
+			if (sourceAspectRatio < cropAspectRatio) {
+				this.crop_width.value = source.naturalWidth;
+				this.crop_height.value = Math.ceil(source.naturalWidth / cropAspectRatio);
+				this.source_x.value = 0;
+				this.source_y.value = Math.ceil((source.naturalHeight - this.crop_height.value) / 2);
+			}
+			// Crop horizontally from the centre, using the entire height.
+			else {
+				this.crop_width.value = Math.ceil(cropAspectRatio * source.naturalHeight);
+				this.crop_height.value = source.naturalHeight;
+				this.source_x.value = Math.ceil((source.naturalWidth - this.crop_width.value) / 2);
+				this.source_y.value = 0;
+			}
+		}
+		// Cropping a top or bottom slice?
+		else {
+			// Can we actually take a top or bottom slice from the original image?
+			if (sourceAspectRatio < cropAspectRatio) {
+				this.crop_width.value = source.naturalWidth;
+				this.crop_height.value = Math.floor(source.naturalHeight / cropAspectRatio);
+				this.source_x.value = "0";
+				this.source_y.value = cropMethod.indexOf("t") !== -1 ? "0" : source.naturalHeight - this.crop_height.value;
+			}
+			// Otherwise, take a vertical slice from the centre.
+			else {
+				this.crop_width.value = Math.floor(source.naturalHeight * cropAspectRatio);
+				this.crop_height.value = source.naturalHeight;
+				this.source_x.value = Math.floor((source.naturalWidth - this.crop_width.value) / 2);
+				this.source_y.value = "0";
+			}
+		}
+	}
+
+	setPositionFormValues() {
 		let current = this.thumbnail_select.options[this.thumbnail_select.selectedIndex].dataset;
 
 		if (typeof current.crop_region === "undefined") {
-			let source_ratio = this.original_image.naturalWidth / this.original_image.naturalHeight,
-				crop_ratio = current.crop_width / current.crop_height,
-				min_dim = Math.min(this.original_image.naturalWidth, this.original_image.naturalHeight);
-
-			// Cropping from the centre?
-			if (current.crop_method === "c") {
-				// Crop vertically from the centre, using the entire width.
-				if (source_ratio < crop_ratio) {
-					this.crop_width.value = this.original_image.naturalWidth;
-					this.crop_height.value = Math.ceil(this.original_image.naturalWidth / crop_ratio);
-					this.source_x.value = 0;
-					this.source_y.value = Math.ceil((this.original_image.naturalHeight - this.crop_height.value) / 2);
-				}
-				// Crop horizontally from the centre, using the entire height.
-				else {
-					this.crop_width.value = Math.ceil(current.crop_width * this.original_image.naturalHeight / current.crop_height);
-					this.crop_height.value = this.original_image.naturalHeight;
-					this.source_x.value = Math.ceil((this.original_image.naturalWidth - this.crop_width.value) / 2);
-					this.source_y.value = 0;
-				}
-			}
-			// Cropping a top or bottom slice?
-			else {
-				// Can we actually take a top or bottom slice from the original image?
-				if (source_ratio < crop_ratio) {
-					this.crop_width.value = this.original_image.naturalWidth;
-					this.crop_height.value = Math.floor(this.original_image.naturalHeight / crop_ratio);
-					this.source_x.value = "0";
-					this.source_y.value = current.crop_method.indexOf("t") !== -1 ? "0" : this.original_image.naturalHeight - this.crop_height.value;
-				}
-				// Otherwise, take a vertical slice from the centre.
-				else {
-					this.crop_width.value = Math.floor(this.original_image.naturalHeight * crop_ratio);
-					this.crop_height.value = this.original_image.naturalHeight;
-					this.source_x.value = Math.floor((this.original_image.naturalWidth - this.crop_width.value) / 2);
-					this.source_y.value = "0";
-				}
-			}
+			let aspectRatio = current.crop_width / current.crop_height;
+			this.setDefaultCrop(aspectRatio, current.crop_method);
 		} else {
 			let region = current.crop_region.split(',');
 			this.crop_width.value = region[0];
@@ -140,7 +144,7 @@ class CropEditor {
 
 	showContainer() {
 		this.container.style.display = '';
-		this.setInputValues();
+		this.setPositionFormValues();
 		this.positionBoundary();
 		this.addEvents();
 	}