Android Consultant - high performance improments

We are looking for Android developer to help us optimize following code:

// this code transforms bitmap for printing in Black and White for Receipt Printer using ESC/POS commands.

for (int i = 0; i < height; i++) {

for (int x = 0; x < tmp; x++)

data[x] = 0;

for (int x = startx; x < width; x++) {

final int pixel = [url removed, login to view](x - startx, i);

if ([url removed, login to view](pixel) == 0 || [url removed, login to view](pixel) == 0

|| [url removed, login to view](pixel) == 0) {

data[x / 8] += 128 >> (x % 8); // (byte) (128 >> (y % 8));



// write(data);


This code is used to transform Bitmap to BW image for printing. On larger images like 400x1000px this has too many iterations and takes 2-5 seconds to compute. We need faster much way. Only bids with genuine response to this particular problem will be accepted.

Skills: Android

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About the Employer:
( 14 reviews ) Brno, Czech Republic

Project ID: #11798404

19 freelancers are bidding on average €17/hour for this job


Hello, How are you? I had read your job description and many interest. I check all tech problem via google,and known that i can do this project well. This project match with my skill and experience, i have fu More

€20 EUR / hour
(46 Reviews)

We have 240+ positive reviews on freelancer site. Quality IT Solutions are top rated team here, see our certifications and client feedback, client relationship (100% recommendation from clients). We are top CRM More

€20 EUR / hour
(41 Reviews)

Hi. I will help you. Using recursive function, I can optimize your code. Please send me message to discuss more. Thank you.

€25 EUR / hour
(13 Reviews)

Hi, Dear Employer! How are you? I read your description carefully and understand your requirements fully. I am really interested in your project. I am 100% sure i can do this. Sure, I will support free bug fixin More

€20 EUR / hour
(47 Reviews)

Hi, I have 5+ years of experience in app development. I have successfully launched 40+ apps on Google Play Store. I have working experience on both Eclipse and android studio. I am especially master in Java. In term More

€20 EUR / hour
(113 Reviews)
€22 EUR / hour
(18 Reviews)

Hi Dear Employer, how are you? I Will Provide You Great And Perfect App To Lead You To The Success In Your Business As Well As Full Services. I saw your project description carefully and thought that your project was More

€20 EUR / hour
(21 Reviews)
€12 EUR / hour
(77 Reviews)

Hello! We are a creative web/mobile development team with experience in creating custom apps with complex interfaces, web API integrated dashboards and 2d games. We can send you an example video with quick run through More

€20 EUR / hour
(2 Reviews)

hello...there...would like to work with you and I have also build that type apps like as a silkysocks..same as prisma app ..currently one as a selfie app if you would like to work with me then ping me... and my contact More

€13 EUR / hour
(19 Reviews)

Hi, I am interested. Thanks Narendra

€18 EUR / hour
(5 Reviews)
€13 EUR / hour
(3 Reviews)

Try this one: public Bitmap toGrayscale(Bitmap bmpOriginal) { int width, height; height = [login to view URL](); width = [login to view URL](); Bitmap bmpGrayscale = [login to view URL] More

€13 EUR / hour
(7 Reviews)

Hello. I'm a android developer that have 8 years of experience of android app. I have ever done the app for printing. There are no problem in implementing your requests. Please inform me if you want to hire me. I More

€12 EUR / hour
(1 Review)
€16 EUR / hour
(3 Reviews)

I am 5+ years experienced in Mobile App (Android/iOS) developing and publishing applications in the respective stores and and Web Development (Ruby on Rails, WordPress, AngularJS, PHP, Javascript etc.). I have More

€12 EUR / hour
(2 Reviews)

Hello I hope you are fine and based on your request, quickly I developed an app where I show the transformation a normal image to an image of color black and white. I use the function "ColorMatrix" and "ColorMatrixColo More

€13 EUR / hour
(0 Reviews)

with over 10years of industry experience and solid foundation in Datastructures and algorithms, i can optimize your problem

€12 EUR / hour
(0 Reviews)

I'm android developer and i developed solution Using computer vision opencv for android ican help you with this.

€16 EUR / hour
(0 Reviews)