fix: correct readme and clean up code

.changeset/quiet-ants-check.md

@@ -0,0 +1,5 @@
+---
+'pixel-scale': patch
+---
+
+Code clean up and corrected readme.

README.md

@@ -27,7 +27,7 @@ art!
   - [`scalePixels(imageData, to, options)`](#scalepixelsimagedata-to-options)
   - [`getPixelScale(imageData, options)`](#getpixelscaleimagedata-options)
   - [`multiplyPixelScale(imageData, by, options)`](#multiplypixelscaleimagedata-by-options)
-  - [`multiplyPixelScale(imageData, by, options)`](#multiplypixelscaleimagedata-by-options-1)
+  - [`dividePixelScale(imageData, by, options)`](#divideixelscaleimagedata-by-options)
 - [About](#about)
   - [ImageData](#imagedata)
   - [Pixel scale](#pixel-scale-1)
@@ -139,9 +139,10 @@ const doubledImageData = multiplyPixelScale(imageData, 2);
 const tenfoldImageData = multiplyPixelScale(imageData, 10, { from: 5 });
 ```
 
-### `multiplyPixelScale(imageData, by, options)`
+### `dividePixelScale(imageData, by, options)`
 
 Similar to `scalePixels`, but downscales the image by the specified amount of times instead of to a specific scale. Detects the current scale of the image if no `options.from` value is provided.
+
 **Parameters:**
 
 - `imageData` (ImageData instance) - The ImageData instance to downscale.

src/helpers/imageData.ts

@@ -5,6 +5,6 @@ export function isValidImageData(imageData: ImageDataLike): imageData is ImageDa
     imageData &&
     typeof imageData.width === 'number' &&
     typeof imageData.height === 'number' &&
-    imageData?.data?.length === imageData.width * imageData.height * 4
+    imageData.data?.length === imageData.width * imageData.height * 4
   );
 }

src/scalePixels.ts

@@ -23,13 +23,10 @@ export function scalePixels(
     // create one row per pixel scale
     for (let rowCount = 0; rowCount < newScale; rowCount++) {
       // loop through each scaled pixel on the row
-      for (let pixelStart = rowStart; pixelStart < rowEnd; pixelStart += currentScale * 4) {
+      for (let pStart = rowStart; pStart < rowEnd; pStart += currentScale * 4) {
         // add the corresponding colors according to the new scale
         for (let colCount = 0; colCount < newScale; colCount++) {
-          newData.push(data[pixelStart]);
-          newData.push(data[pixelStart + 1]);
-          newData.push(data[pixelStart + 2]);
-          newData.push(data[pixelStart + 3]);
+          newData.push(data[pStart], data[pStart + 1], data[pStart + 2], data[pStart + 3]);
         }
       }
     }
@@ -40,20 +37,18 @@ export function scalePixels(
 
 export function multiplyPixelScale(
   imageData: ImageData,
-  by: number,
+  multiplier: number,
   options?: ScalePixelsOptions | undefined | null
 ) {
   const scale = getPixelScale(imageData, options);
-  const to = scale * by;
-  return scalePixels(imageData, to, options);
+  return scalePixels(imageData, scale * multiplier, options);
 }
 
 export function dividePixelScale(
   imageData: ImageData,
-  by: number,
+  divider: number,
   options?: ScalePixelsOptions | undefined | null
 ) {
   const scale = getPixelScale(imageData, options);
-  const to = scale / by;
-  return scalePixels(imageData, to, options);
+  return scalePixels(imageData, scale / divider, options);
 }