Maybe provide such function later. Why you need this?

I use it for prototyping boards using a photoresist dry film. The procedure is simple and fast (under 20 minutes): print the negative of copper areas on a transparent paper. With the film attached to board (warmed up a little) and the transparent paper positioned correctly on the film, expose to a desk light for 15 minutes or UV-A light for under a minute. the exposed areas become harder to etchant and non-exposed areas are washed off using baking soda. Then etch. The quality is perfect. If decided to provide such a function, please make it work on the mirrored images as well. Thank you

A workaround may be to upload your pdf to: http://image.online-convert.com/convert-to-png In `Quality settings:` select: `Best quality` and in the `Optional settings > Color` section select the `negate` option Then click `Convert file` and print out the resultant downloaded .png file

@andyfierman The quality is far more acceptable if you set the DPI to 600 dots per inch and check the Enhance option in addition to your instructions. I don't have a clue what all other options do, but I do know that photons are quite precise. Thank you

It sounds as if you doing this so that you can make your own PCBs. Have you had a look at the pricing for ordering them directly from EasyEDA? From your PCB layout, click on the `Fabrication output...` button to see an instant quote for an MOQ of 5 PCBs. ![enter image description here][1] You might be pleasantly surprised. :) [1]: /editor/20160818/57b5cc05db190.png

@andyfierman Sure, That is why I'll be using EasyEDA. I should be able to get my boards delivered to Tehran from Shenzhen. but for prototyping I should do it on my own. Thank you Andy

yes, its need options

Please see: https://easyeda.com/forum/topic/How_to_negate_a_layer_for_hand_PCB_etching-sIsmEWdvN

when it comes to converters, you can also use this [png online converter][1]. [1]: http://jpgtopng.com/