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Colorize Images

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Colorize Images is an automatic Machine Learning based service to colorize black and white, grayscale or nightvision photos.

The black & white photo for the colorization can be selected from the gallery, or it can be shared from the other applications such as Twitter, Facebook, Chrome or Google Photos. The colorful result image can be shared to the other applications, or saved into the gallery.

No watermarks nor any other additions are made to the images!

Colorize Images app can be used for free by watching Ads. Subscribing the app removes the Ads and allow unlimited colorizations without interruptions.
The monthly subscription rate is about $1.50 and yearly subscription rate about $10.00 depending on the local taxes etc. The 8 hour access time is about $1.00. The exact rates for your country/state are shown in the app. The active purchases allow unlimited number of colorizations.

The service uses network data and external GPU capacity to provide the colorization functionality. This means that the source images are sent to a remote location over the network, colorized there and the resulting images are then received from the remote location over the network.

For the best result, the source image is recommended to have:

  • good quality
  • good contrast
  • good focus
  • and correct orientation
The images not having all these properties may work fine, but some preprocessing (like contrast correction or sharpening) usually improves the result.

Using Colorize Images Android app

Colorize Images is an automatic Machine Learning based service to colorize black and white, grayscale or nightvision photos.

The black & white photo for the colorization can be selected from the gallery, or it can be shared from the other applications such as Twitter, Facebook, Chrome or Google Photos. The colorful result image can be shared to the other applications, or saved into the gallery.



Main Screen
Purchase Options
Tuning Menu
Share Menu


Main Screen



Colorized switch

Colorized switch can be used to switch the displayed image between the original (usually grayscale) and the colorized photo.

Menu / Toolbar


Toolbar and Menu (on the top right) contain the following actions. Their location depends on the size of the screen.

Load

Load an image from the Gallery for the colorization.

Save

Save the colorized image to the Gallery.

Share

Share the colorized image to an other application or to social media. See available sharing options here.

About

Information about the application version, and the email link to contact us with some identification details.

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Purchase Options


The application can be used for free by watching Ads. Subscribing the app removes the Ads and allow unlimited colorizations without interruptions. Please note that the application uses paid GPU resources in the cloud to provide the colorizations. The payments are used to cover the costs, and therefore enable the existence of the service.

The number of free trial colorizations left can be seen in the About screen.

The prices for the purchase options are shown in the application menu. The exact rates vary depending on the country/state taxes.

Buy Access for 8 hours

The 8 hours usage allows the application to be fully used for the next 8 hours after the purchase is made. The access activates immediately after the purchase and the remaining time can be seen in the About screen.
This is a single payment without automatic renewing.

Monthly Subscription

The monthly subscription is an automatically renewing subscription that is paid once a month, and allows the application to be fully used while the subscription is active.
The renewing of the subscription can be canceled at any time via Google Play Store.

Yearly Subscription

The yearly subscription is an automatically renewing subscription that is paid once a year, and allows the application to be fully used while the subscription is active.
The renewing of the subscription can be canceled at any time via Google Play Store.

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Tuning Menu



Render Factor

Render Factor defines the resolution at which the colorization is done. Lower resolution is faster and the result is usually more colorful. Especially very old and low quality images are usually colorized better with lower Render Factor values. High quality images may have better results with the higher Render Factor values which use more details in the coloring. However, the results are not usually as colorful as with the lower values.
The default value of 21 works in many cases, but if the colors are missing or there are colors in wrong places, you can try to decrease or increase Render Factor until you find the best result for your photo.

Auto Contrast Cutoff

Auto Contrast normalizes and tunes the image contrast for the colorization. The modified contrast may affect the details the colorization function sees and can therefore improve the quality of the colorization. The cutoff value tells how many percent of the lightest and the darkest pixels of the image histogram are removed. After that the image pixels are remapped to the new range.

For the images having a good quality and a good contrast, the best choice is usually 0. For the others, you may try values between 1 to 10.

Please note that the Auto Contrast affects only to the colors added to the image. To tune the contrast of the whole image, it needs to be done separately before the colorization in some photo editor.

It's always a good idea to preprocess the images to have the best possible brightness, contrast and correct orientation before the colorization. This usually improves the results a lot.

Examples

Black and White with good contrast
Colorized, Render Factor = 15, Contrast = 0
Colorized, Render Factor = 21, Contrast = 0
Colorized, Render Factor = 25, Contrast = 0
Colorized, Render Factor = 35, Contrast = 0
Colorized, Render Factor = 45, Contrast = 0
Black and White, bad contrast, detailed
Colorized, Render Factor = 25, Contrast = 0
Colorized, Render Factor = 25, Contrast = 5
Colorized, Render Factor = 45, Contrast = 0
Colorized, Render Factor = 45, Contrast = 1
Colorized, Render Factor = 45, Contrast = 5
Colorized, Render Factor = 45, Contrast = 10


Save as Defaults

Save as Defaults button saves the selected Render Factor and Auto Contrast Cutoff values to be used for the colorizations also after the restart of the application. Without saving, the selected values are used for all the colorizations during the active session. After restarting the application, the values are restored back to the saved ones (or to the default ones if no saved configuration is found.)

ReColorize

After you have changed the values for Render Factor and/or Auto Contrast cutoff, you can colorize the same photo again with the new values by pressing ReColorize button. The previous colorization will be replaced with the new one.

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Share Menu



Share as Image

Shares the colorized image as a bitmap image. This includes the image into the shared content, for example into email as attachment.

Share as Link

Shares the colorized image as a hosted image. The shared image is located in Colorize Images server and the URL link to the colorized image is shared.

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