InvisiLetter/InvisiReader

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twitter : @tamochan@munepi

Thank you for visiting our application – InvisiLetter / InvisiReader- support page!

You can embed the secret image that you draw into your image. Moreover, you can easily send mail to which the secret image is embedded to your friends by using InvisiLetter. If your friends have InvisiLetter or InvisiReader, they will be able to see the secret image that you embedded.

In this page, we will show you how to use this application

Use InvisiLetter for…

  • A copyright message
  • An image caption or an explanation
  • A secret message ( Even if the image is seen by the person from whom the message doesn’t want to be seen, it is safe… Steganography.)
  • And more…

1. Let’s embed the secret image into your image!

Step1. Select your  image which you want to send to your friends

Install InvisiLetter from AppStore, and start it. You will be able to show main menu like this, and touch the button “Embedding Secret Image”.

Main Menu

Touch “Step 1″ button and you can select the image to send via mail from iPhone “Photo Album” or iPhone camera.

Touch "Step1"

You can select the image from "Photo Album" or "Camera".

After selecting the image, you return this view.

Step2. Draw the secret image to embed.

Touch “Step2″ button and you can draw a secret image to embed on the selected image.

Touch "Step2"

You can draw a secret image to embed by your finger. If you push "Clear" button, you can clear the image you are drawing.

After drawing the secret image, you return this view.

Step3 Send a mail.

If you touch “Step3″ button, InvisiLetter  start to process to embed the secret image into your image. After ending this process, you will be able to show this view to send this embedded image to your friend and so on. You should tell the people who want to show the secret image to download InvisiLetter and show the secret image by using InvisiLetter.

Touch "Step3"

After processing, you can send a mail which embedded image is attached.

The color of the image changes slightly by the embedded process. InivisiLetter supports 480×320 pixel maximum and only PNG format. SMS/MMS is NOT supported by Invisiletter. We will described later about “Quality priority”.

2. Let’s extract the secret image!

Please download InvisiLetter/InvisiReader and look at a secret image if you are said by your friend, “A secret image was sent by using InvisiLetter”.  Touch long (hold) and copy the image received with mail onto the clipboard. Afterwards, start InvisiLetter / InvisiReader.

Here is a sample of  embedded image.  In Safari, hold this image and copy the image onto the clipboard. Then, start InvisiLetter.

NEW! : InvisiLetter can extract secret image from your Photo Album.

Touch long and copy the image onto the clipboard.

Touch "Extracting secret image..." (InvisiLetter can select the image from your Photo Album)

Shake or incline your iPhone and then...

You can show the secret image!

The noise gets on the secret image that you extracted a little. This is due to the feature of this application. Please acknowledge it.

Appendix : Quality Priority

You can select embedding strength and control the quality of the embedded image.

Quality priority.

If you select "Your Image", the quality of the embedded image is better, but...

The quality of extracted secret image is low.

If you select "Secret Image", the quality of the embedded image is low, but...

You can more certainly convey messages to the friend.

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