04
Sep
11

Mix a little colour and black and white in your images

I recently became of one existing app and one new comer from the same developer. The first was RainbowBrush and the second was SketchBrush.

RainbowBrush

RainbowBrush

Scr000067If you have an image and you want it to look different with the subject this application may interest you.

The basic concept is that you select an image stored on your phone and open it with RainbowBrush. The first thing the app does is convert the image into grey scale, with the ability to re-colour portions of the image with the touch of your finger whilst enabling the user to zoom and pan to aid accuracy of re-colouring location. I you make any mistakes when re-colouring alongside the colour button there is a de-colour button to clean up any unwanted colouring over the lines.

The main limitation of this app is that it suggests that the image is downsize to 0.8Mb which is a little small when compared with the image capture capability of phones like the Nokia N8. The reason for this suggestion is that the operations required for this app are very RAM hungry as image manipulation often is. Other apps like HDR Photo Camera and alike appear to manage higher resolution image processing when on-device HDR fusing, but these are aided by the fact that the user is not expected to interact with the phone during the processing. RainbowBrush has to perform real-time image manipulation whilst providing fast user responsiveness so this is a limitation that has to be accepted.

If you are prepared to spend time post processing on you PC you could, of course use the likes of Paint Shop Pro or similar to achieve the same result, but with higher resolution and greater accuracy. The main advantage of RainbowBrush is that it gives you quick, on device results, which depending on what you want to do with the final image, are more than good enough.

One issue I had with this app is the size and close proximity of the pan, re-colour and de-colour buttons meaning that on a number of occasion I would tap to pan and find myself re-colouring or go to re-colour and find myself de-colouring. I don’t have chunky fingers, so it would be nice to have a little spacing between the buttons or maybe larger buttons.

With a price tag of £1.50 this little app will not break the bank and is fun if a little fiddly to use.

SketchBrush

RainbowSketch

Scr000066To follow on from the initial re-colouring, subject accentuation app above the developer (Oleg Derevenetz) has released SketchBrush which, rather than converting the image to grey scale changes the image to an outline rendering giving it the appearance of a simple sketch. The remainder of the application works in the same way as RainbowBrush.

The limitations of this app are the same as those for RainbowBrush as the processing engine is the same with the only real difference being it’s outline rendered start position.

Based on the strong similarities between the apps the pros and cons of RainbowBrush roll over to SketchBrush.

With the same price tag as RainbowBrush (£1.50) this will also minimise it’s impact on your back balance.

Overall Conclusion

Whilst both apps cost the same I prefer the original and would rather the apps be merged to provide a single app with multiple initiation modes adding sepia etc. If pushed I would purchase RainbowBrush, but would probably keep the money in the bank when it came to SketchBrush. I would, however, pay a little more for a combined app with a few more initial image conversions.

Update

Following the initial posting of this review I have been informed by the developer (See Comments) that a

new “combined” application is now in development and soon will be available at Ovi Store – MagicPhotos. It will offer three image effects: decolorized image (as in RainbowBrush), sketch image (as in SketchBrush, but with better sketch quality), and blurred image – with real-time switching between these modes – but will have the same price as RainbowBrush.

This sounds interesting and I look forward to checking it out.

Sample Images

Below is an example of the output from the two apps with the same original image file.

Graffiti

Above is the original image

Test2

Above is a modified image using RainbowBrush

Test

Above is a modified image using SketchBrush

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5 Responses to “Mix a little colour and black and white in your images”


  1. 1 Oleg Derevenetz
    September 5, 2011 at 7:08 am

    I would like to clarify suggestion of downsize to 0.8Mpix in RainbowBrush 🙂 I think that comparison with HDR Photo Camera and similar apps is slightly incorrect, because HDR Photo Camera does not offer zoom and arbitrary image editing capabilities (including undo operations) at real-time. As I remember, in HDR Photo Camera app, even at 0.5Mpix, you have about 1 minute of “processing” stage in case of enabled fusing, and even so it requires a large amount of RAM and space on your flash drive. It so happens that responsive UI with real-time image editing capabilities is still requires RAM.

    • September 5, 2011 at 7:36 pm

      I understand you point and will update the post to reflect this. My point was that apps like HDR Photo Camera do complex image manipulation on higher resolution images, but this is done whilst the phone is not in use. I accept that RainbowBrush has to provide responsiveness to user input whilst re-colouring or de-colouring.

  2. 3 Oleg Derevenetz
    September 5, 2011 at 7:25 am

    Also, in accordance with your wishes, there is new “combined” application now in development and soon will be available at Ovi Store – MagicPhotos. It will offer three image effects: decolorized image (as in RainbowBrush), sketch image (as in SketchBrush, but with better sketch quality), and blurred image – with real-time switching between these modes – but will have the same price as RainbowBrush.


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