diff --git a/src/cmdline_sprite.c b/src/cmdline_sprite.c
index dff9acbf18..7f4c12974f 100644
--- a/src/cmdline_sprite.c
+++ b/src/cmdline_sprite.c
@@ -21,6 +21,7 @@
 #include <lodepng/lodepng.h>
 #include "cmdline.h"
 #include "drawing/drawing.h"
+#include "image_io.h"
 #include "platform/platform.h"
 #include "util/util.h"
 #include "openrct2.h"
@@ -168,33 +169,11 @@ bool sprite_file_export(int spriteIndex, const char *outPath)
 	memcpy(spriteFilePalette, _standardPalette, 256 * 4);
 	gfx_rle_sprite_to_buffer(spriteHeader->offset, pixels, (uint8*)spriteFilePalette, &dpi, IMAGE_TYPE_NO_BACKGROUND, 0, spriteHeader->height, 0, spriteHeader->width);
 
-	LodePNGState pngState;
-	unsigned int pngError;
-	unsigned char* pngData;
-	size_t pngSize;
-
-	lodepng_state_init(&pngState);
-	pngState.info_raw.colortype = LCT_PALETTE;
-	lodepng_palette_add(&pngState.info_raw, 0, 0, 0, 0);
-	for (int i = 1; i < 256; i++) {
-		lodepng_palette_add(
-			&pngState.info_raw,
-			spriteFilePalette[i].r,
-			spriteFilePalette[i].g,
-			spriteFilePalette[i].b,
-			255
-		);
-	}
-
-	pngError = lodepng_encode(&pngData, &pngSize, pixels, spriteHeader->width, spriteHeader->height, &pngState);
-	if (pngError != 0) {
-		free(pngData);
-		fprintf(stderr, "Error creating PNG data, %u: %s", pngError, lodepng_error_text(pngError));
-		return false;
-	} else {
-		lodepng_save_file(pngData, pngSize, outPath);
-		free(pngData);
+	if (image_io_png_write(&dpi, (rct_palette*)spriteFilePalette, outPath)) {
 		return true;
+	} else {
+		fprintf(stderr, "Error writing PNG");
+		return false;
 	}
 }
 
diff --git a/src/image_io.c b/src/image_io.c
index 0dbb87ace5..d6e90decbc 100644
--- a/src/image_io.c
+++ b/src/image_io.c
@@ -61,6 +61,8 @@ bool image_io_png_write(const rct_drawpixelinfo *dpi, const rct_palette *palette
 		png_ptr, info_ptr, dpi->width, dpi->height, 8,
 		PNG_COLOR_TYPE_PALETTE, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT
 	);
+	png_byte transparentIndex = 0;
+	png_set_tRNS(png_ptr, info_ptr, &transparentIndex, 1, NULL);
 	png_write_info(png_ptr, info_ptr);
 
 	// Write pixels
@@ -89,7 +91,8 @@ bool image_io_png_write(const rct_drawpixelinfo *dpi, const rct_palette *palette
 	// Get image size
 	int stride = dpi->width + dpi->pitch;
 
-	for (int i = 0; i < 256; i++) {
+	lodepng_palette_add(&state.info_raw, 0, 0, 0, 0);
+	for (int i = 1; i < 256; i++) {
 		const rct_palette_entry *entry = &palette->entries[i];
 		uint8 r = entry->red;
 		uint8 g = entry->green;
@@ -100,6 +103,7 @@ bool image_io_png_write(const rct_drawpixelinfo *dpi, const rct_palette *palette
 
 	error = lodepng_encode(&png, &pngSize, dpi->bits, stride, dpi->height, &state);
 	if (error != 0) {
+		log_error("Error creating PNG data, %u: %s", error, lodepng_error_text(error));
 		free(png);
 		return false;
 	} else {