How to read color manga on the Kobo Libra Colour and other color e-ink screens

For 20 years, e-readers were black and white, which suits traditional Japanese manga. Korean manhwa, webtoons and Western graphic novels are in color, though.

In 2024, Rakuten released the Kobo Libra Colour, an affordable color e-reader. Its screen uses Kaleido 3, and color files need some preparation to look good on it.

If you drop a standard color PDF or CBZ onto a Kaleido 3 display, it will look washed out. Here is why, and what you can do about it.

How Kaleido 3 shows color

A tablet screen makes its own light, so colors look bright and saturated. A Kaleido 3 e-ink screen works differently. Underneath the glass, it has a standard black-and-white grid of capsules. Layered directly on top of that is a Color Filter Array (CFA).

Because the color is created by ambient light passing through a filter, bouncing off a white background, and coming back through the filter:

1. Colors are darker. The filter physically blocks light, putting a grey "mesh" over the screen.
2. Colors are muted. You get "pastel" versions of colors. A bright neon red webtoon panel will turn into a dull brick red.
3. Resolution drops. Black-and-white text is sharp at 300 PPI, but the color layer is only 150 PPI. Fine color details become blurry.

Adjusting files by hand

If you have a collection of .cbz color webtoons, the usual advice over the last year has been to remaster them for the screen by hand:

1. Extract the folder of JPEGs.
2. Open Photoshop and create a batch action script.
3. Raise the Saturation by 30%.
4. Raise the Brightness by 15% to make up for the darker CFA filter.
5. Slice the vertical panels.
6. Re-zip them as a CBZ, or convert them to KEPUB.

It takes an evening, but colors come out noticeably stronger on Kaleido 3.

Where MangaSendr fits on a Kobo

MangaSendr is built around Kindles. It emails converted files to a Kindle's Send-to-Kindle address, and it has no Kobo delivery and no Kobo-specific preset. It also doesn't color-correct for Kaleido screens or slice webtoons, so the saturation and brightness steps above are still yours to do if you want them.

What it can help with is the packaging step, so the Kobo gets a clean file:

1. Use the free converter

The free converter takes a CBZ, ZIP, or image file of up to 200 MB and gives you an EPUB or CBZ to download. It doesn't need an account, and you can run 3 conversions a day. If you have a MangaSendr account, you can also download converted files there instead of having them emailed.

2. Choose CBZ for color pages

The converter's EPUB output is grayscale, made for black-and-white Kindle screens. For a color Kobo, pick CBZ instead. The Kobo opens CBZ files natively, and your pages keep their color.

3. Copy the file over

Connect the Kobo to your computer with a USB cable and it shows up as a drive. Drag the file onto it, eject, and the book appears in your library.

4. Slice webtoons first

MangaSendr doesn't cut long vertical strips into pages. If your file is a single continuous webtoon strip, cut it into page-height images with another tool before converting. Our webtoon guide covers how.

The desktop app and Kobo

The MangaSendr desktop app is built for Kindles too. It can watch a folder and email new files to a Kindle, and it can copy files to a Kindle that shows up as a drive over USB. Neither feature is made for Kobo, so on a Kobo, stick with the converter and a cable.

Kaleido 3 will always look softer than a tablet, but a little prep before you copy files over makes a visible difference.

• Kobo owners: the free converter turns a CBZ, ZIP, or image file into an EPUB or CBZ to copy over. No account needed.
• Kindle owners: MangaSendr emails converted files straight to your Kindle. Your first delivery is free. Pricing covers what's included after that.