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Make sure, there is enough image resolution (I like to recommend 300) When resolution decreases image quality decreases. The way to change image resolution in Keynote is: Inspector > Document > Document > and select Custom from the Slide Size drop down menu. Now export the drawings and check the result.
Try this: Copy the image in Keynote, you can then open Preview and select "New from Clipboard" to paste the image, and save it as a PDF. That will preserve the transparency. If you have Adobe Photoshop or illustrator,, open that PDF on it and save as PNG.
If you do not have Photoshop or illustrator, follow below steps:Download and install the free public beta of the App Skitch from http://plasq.com/skitch , Copy your artwork from Keynote, Paste into Skitch then set it's background to transparent. Export the image from there and check the result.
I am not on a Mac now. Please send me the PDF files. I will convert it to PNG and test.
Yes, I know. Copy the image in Keynote. Tthen open Preview and select "New from Clipboard" to paste the image, and save it as a PDF. Send me that PDF.
Please check this PNG. Preview it in 100%. Zooming larger will reduce the quality because PNG is a bitmap format and not vector.
Did you check the PNG file I sent ? Is there any resolution drop ? I can't find any resolution drop on the PNG I sent.
Okay, if so please try the following link:
Download the PNG file and check it.
Please check thsi PDF
Okay, will send the sample without background later