CHange svg creation logic

lib/postprocessing/image.js

@@ -634,10 +634,16 @@ async function imagePostProcess(intermediateRendition, rendition, directories) {
 
 function convertSvg(img, instructions) {
     // ImageMagick automatically keeps aspect ratio
-    // Only using width because ImageMagick will use the smallest value whether it be width or height
-    const width = instructions.width || SVG_DEFAULT_WIDTH;
+    let imageSize = SVG_DEFAULT_WIDTH;
 
-    img = handleTransparency(img, instructions);
+    if(instructions.width && instructions.height) {
+      // image magick will keep aspect ratio
+      imageSize = `${instructions.width}x${instructions.height}`;
+    } else if(instructions.width) {
+      imageSize = `${instructions.width}x`;
+    } else if(instructions.height) {
+      imageSize = `x${instructions.height}`;
+    }
 
     // some svgs have no size (only percentage width/height), so we scale them to our target size
     img.in("-size", `${width}`); // 2020-11-10 img.rawSize() will not be applied at the correct time and the SVG will be upscaled resulting in a fuzzy final rendition