I would not trust a different smart phone app. This works fine, and not susceptible to the marker transparency issues, although it is quite buried in the interface. Tap the +, select Square, position, and then tap the options button and change the style from outline to a filled in shape. It is possible to add a rectangle shape with a solid color. (Or even if they're not paranoid you may worry about them unintentionally leaking some information in an exported image.) If you feel safe using MS Paint or Photoshop then you may use them instead. If you're paranoid you might worry about proprietary image editors embedding watermarks or steganographic information. (Strip the original metadata and history from the photo.) Importing the image into GIMP probably does the same thing as what you want taking a screenshot of the marked-up image to do. (Make the redactions more obvious.) I would not rely on the flood fill alone on the off chance that I accidentally use the wrong tool settings. Changing the color to black is just for the recipient's benefit. The fool proof method would be to use the rectangle selection box, press delete, and fill (without deselecting) the same space black.įlood filling the space in with black doesn't redact anything more than what the deletion deletion did. I suggest importing the image in GIMP, manipulating it, then export in JPEG or PNG format. However I wouldn't be shocked if the pen tool was semi-transparent in other iOS versions. That article recommends against using the pen tool, even though they say it is opaque, because it's hard to completely write over text with such small lines. If you search "ios markup redaction" you'll probably see PSA: iOS Markup is not designed to be a redaction tool for sensitive information. (Even if you use the opacity slider at its max setting.) It's not safe to use Markup's pencil or marker tools for redaction because they are not opaque. PS - The images above are examples and not the actual thing I sent! It just says "LALALALALA BATMAN!" Using whatever technique you want, is there any way possible way to see what is under the blacked out parts in the screenshot, because that was what I actually then sent to the journalist. So, let's say this was the edited original picture (it's in JPEG format because when I sent it from my iPhone via iCloud mail to my other email address then downloaded it on to my laptop from that other email address, it downloaded in JPEG, but the screenshot downloaded as a PNG):
Then, I sent that image from my desktop to the journalist. Then, I took a screenshot, then sent the screenshot from my phone to my email account, then downloaded the image to my laptop. However, one of the images contained my date of birth and other personal information so I blacked it out using markup tools in the Photos app of my iPhone 6 (running iOS 10.3.2). Ok, so I sent some pictures to a journalist to report something I thought was noteworthy.
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