bitmap

What is alpha bitmap and colorkey bitmap ?

Hi, I was going through the bitmapmixer sample in dshownet samples folder and I noticed that drawing on the video is done by alphabitmap and colorkey bitmap. I would like to know what these are ? what is the difference between them ? Many Thanks ...

AggPas Delphi Drawing Transparencies

What im trying to do I have a drawing procedure (it works) it draws to a bitmap "OBJmap" it then puts OBJmap into Wholemap,, this all works but there is a issue,, it seems to treat the undefined parts of objmap as white even though objmap and wholemap is set as PF32Bit. and hence when it puts objmap into wholemap i get a white box behin...

Can't get a video thumbnail in Android 2.0+

I tried to create a video thumbnail as described here. I also read the reference here. In my app I first let the user choose a video with: startActivityForResult(new Intent(Intent.ACTION_GET_CONTENT).setType("video/*"), ACTIVITY_PICKVIDEO); Then I determine the video ID with: fileID = Integer.parseInt(contentUri.getLastPathSegment()...

How to get exact RGB values for 24-bit image in .NET Compact Framework?

Hello, I have a 24 bit BMP image, but when I load it on my Pocket PC using Bitmap object and do GetPixel, it returns me slightly wrong RGB values. I guess it converts it to 16 bit on the fly. I get the same results when using LockBits and working with the bitmap data directly. Is there any way of getting exact RGB values for given pixel...

Android: Resizing and scaling a part of the image

Given an image, I want to be able to scale only a part of that image. Say, I want to expand half of the image so that, that half takes up the whole space. How is this possible? Will ImageView fitXY work because I thought it'll work only for the whole original image. @Override public void onCreate(Bundle savedInstanceState) { super.onC...

Crop Bitmap without reading entire Bitmap first

I have a very large image and I only want to display a section the size of the display (no scaling), and the section should just be the center of the image. Because the image is very large I cannot read the entire image into memory and then crop it. This is what I have so far but it will give OutOfMemory for large images. Also I don't th...

Differences between Bitmaps and BufferedImages

I am trying to port some code from a regular java program into the android platform. Unfortunately, a significant part of the program involves manipulating images, and java's awt was taken away from me. I am trying to replace awt.BufferedImage with a Bitmap, and was hoping that the only differences between the two classes would be their ...

android why i can't retrieve a compressed bitmap?

here is what i do FileOutputStream out = new FileOutputStream( "/sdcard/Deltio1.jpg"); Bitmap e = BitmapFactory.decodeByteArray(imageData, 0, imageData.length); e.compress(Bitmap.CompressFormat.JPEG, 65, out); out.close(); and to retrieve ...

Android - A different Bitmap wallpaper for every home screen - OutOfMemory

I am trying to set a different wallpaper for every home screen, but I get OutOfMemory issues. I have 5 Bitmaps which I am trying to overlay on a wallpaper Bitmap which is 5 times the display width. Using the code below I get OOM. The problem seems to be the first line of code which creates the large wallpaper Bitmap. My question is wheth...

Draw transparent lines on bitmap via touch input

Hi all, I am working on a paint application for Android. Now I want to implement an eraser to allow erasing parts of a loaded bitmap by using touch input and making the bitmap transparent along the finger's path. A very good example of what I try to achieve is shown in the application Steamy Window for Android. Steamy Window simulates...

What is the best way to transfer an image via a webservice in C#?

What is the best way to transfer an image in C#? Bitmap object Byte array Image Object? ...

out of memory error dealing with large bitmaps and the android activity life cycle

I have a scrollable map app which for now has a huge bitmap. It loads fine on startup, but when it looses foreground status and the user brings it backs again im getting an out of memory error. In onPause it trashes the bitmap using recycle, and marks it as null. The onResume checks to see if map==null and will load the bitmap back again...

Load image from url in Android, only if small

I'm using BitmapFactory.decodeStream to load an image from a url in Android. I want to only download images below a certain size, and I'm currently using getContentLength to check this. However, I'm told that getContentLength doesn't always provide the size of the file, and in those cases I would like to stop the download as soon as I ...

Bitmap <-> JPEG Conversion

I have an application that use the image captured by the mobile camera and sends it to a webservice. Currently I am putting the image in a byte[] which then will be transmitted. This is done by: filename = cameracapturedialog.FileName; FileStream fs = new FileStream(filename, FileMode.Open); byte[] ImageByte = new byte[fs.Length]; //fi...

Android: Resize a large bitmap file to scaled output file.

I have a large bitmap (say 3888x2592) in a file. Now, I want to resize that bitmap to 800x533 and save it to another file. I normally would scale the bitmap by calling Bitmap.createBitmap method but it needs a source bitmap as the first argument, which I can't provide because loading the original image into a Bitmap object would of cours...

Gdiplus::Bitmap to BYTE array?

Hi, well, as so often title says it all. Here's my attempt (ugly GDI+ and GDI mix...) // ... BYTE pixels[BMP_WIDTH * BMP_HEIGHT * BMP_BPP]; HBITMAP hBitmap; Gdiplus::Bitmap cBitmap(BMP_WIDTH, BMP_HEIGHT, PixelFormat32bppRGB); Gdiplus::Graphics cGraphics(&cBitmap); Gdiplus::Pen cPen(Gdiplus::Color(255,...

WPF, am I a bitmap or a PNG

My goal is to work with bitmaps but store them as PNG bit arrays. I have: BitmapImage imageGrass = (BitmapImage)this.FindResource("imageGrass"); I am curious at this point if this is a bitmap or a PNG. If i user copy pixels I know for sure its uncompressed bitmap. Where I am failing is: PngBitmapEncoder encoder = new PngBitmapEncoder...

RAM saving when loading many Bitmap objects

Hello. Is there any difference when you load into bitmap the same image from bmp or from png (or other format)? Does the original image format influence Bitmap object size in RAM? Is there a way to archive Bitmap objects in order to make them less RAM resources consuming? Thanks ...

Overlay two bitmap images in WPF.

Hi there, I need to overlay two images (say, JPEG and PNG with transparency). Input: - JPEG image - PNG image Output: - JPEG image with PNG applied. What is the best approach to do that? Thank you in advance for the replies and hints! Cheers ...

How to draw readable tiny text quickly

In developing a flash-based memory manager, I need to be able to view large quantities of data. With my eyes and monitor resolution, I can read hand-drawn 3x5 letters on a 4x6 matrix without too much difficulty, but none of the system TrueType fonts render optimally at that size. I've tried writing code to draw font shapes to off-scree...