Improved PNG output

README.md

@@ -49,6 +49,7 @@ You can find the latest released binary at the following links:
 * Use high quality source files. **This little detail have a major impact on the final result.**
 * Read tooltip of _High/Ultra quality_ option. There are many important informations there.
 * When converting images smaller than device resolution remember to enable upscaling.
+* Enabling _PNG output_ can decrease size of created file up to 33%. But it also highly increase time needed to create MOBI.
 * Panel View (auto zooming every part of page) can be disabled directly on Kindle. There is no KCC option to do that.
 * If you're converting color images and the end result is not satisfactory, experiment with gamma correction option (check 1.0 setting first).
 * Check our [wiki](https://github.com/ciromattia/kcc/wiki/Other-devices) for a list of tested Non-Kindle E-Readers.
@@ -87,7 +88,7 @@ Options:
     --blackborders      Disable autodetection and force black borders
     --whiteborders      Disable autodetection and force white borders
     --forcecolor        Don't convert images to grayscale
-    --forcepng          Create PNG files instead JPEG (For non-Kindle devices)
+    --forcepng          Create PNG files instead JPEG
     --gamma=GAMMA       Apply gamma correction to linearize the image [Default=Auto]
     --nocutpagenumbers  Don't try to cut page numbering on images
     --noprocessing      Don't apply image preprocessing