Android :: Save Bitmap As JPEG - Always With Low Compression Level
Aug 19, 2009
I am trying to save a bitmap in a JPEG format, and i can see that the image is always stored with a lower quality even if i give the compression level as 100, however for PNG it is working fine. Similarly during Media.insert() or getContentResolver().insert() the image is stored with a lesser quality, I can see in that the compression level is 50 in the Media.java, however I tried to create my own method for the same function with quality 100.
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Jan 31, 2013
What is the best compression level for APK??
and what are the advantages and disadvantages of it?
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Sep 8, 2010
My app will have an SQLite database with some embedded JPEG images -- basically the binary contents of a JPEG file stored as a Blob in the database. Can someone point me in the general direction of where to start to figure out how to convert this "array of bytes" into a Bitmap object that can be further manipulated and displayed in an ImageView?
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Apr 2, 2009
I am 1) taking a picture and 2) then draw another Bitmap on top of it 3) then I store it
I am doing it as follows and it works on the emulator.
On the device I get a OutOfMemoryError: bitmap size exceeds VM budget android.graphics.Bitmap.nativeCopy(Native Method) android.graphics.Bitmap.copy(Bitmap.java:199) in the line copy the Bitmap to get a mutable Bitmap.
CODE:...........
What I am asking:
a) Is there a better way to do what I am doing? 1) take a picture 2) draw another Bitmap on top of it 3) then I store it
b) What is the best way to create a mutable Bitmap from the picture I just took with the camera?
In my app, resolution is not an issue. If it works better for small photos that would be fine.
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Jun 23, 2009
I would like to save a preview frame as a jpeg image.
I have tried to write the following code...
but it's not possible to open a saved file as a jpeg image. Does anyone know how to save preview frames as jpeg images?
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Apr 13, 2009
I managed to handle a full size image (2048x1536) (moving around, zooming, some colorfilters, etc). However, i can only load these images in memory as RGB_565, one at a time. I try to free as much bitmap memory as possible (by recycling every possible bitmap cached/ open in my app), and then load the full-sized image in RGB_565 format. This works well.
The user can make some modifications (color balance, brightness, etc) and I like to save the resulting image in a JPEG file. However, on screen, all edits are shown in RGB_565. You can see the posterization because of the reduced pixel-depth. The quality degradation on the screen is a minor problem. My main problem is to apply these edits to the actual and higher quality ARGB_8888 data of the original JPEG file.
Trying to load a ARGB_8888 JPEG file with size 2048x1536 is not possible. I get an out-of-memory error. Is there any way to apply color-filters to ARGB_8888 data (instead of RGB_565) so that i won't lose a lot of image-quality when trying to save modifications into a JPEG file?
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Jun 23, 2010
1.myJpegFile = new File("images/jpegImage.jpg");
2.output = new BufferedOutputStream(new FileOutputStream(myJpegFile));
3.encoder = JPEGCodec.createJPEGEncoder(output);
4.encoder.encode(myJpegImage); Please could you give me the equivalent code for line no. 3 and 4 in Android?
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Mar 16, 2009
I am working on a function to download an image from a web server, redisplay it on the screen, and if the user wishes to keep the image, save it on the SD card in a certain folder. Is there an easy way to take a bitmap and just save it to the SD card in a folder of my choice?My issue is that I can download the image, display it on screen as a Bitmap. The only way I have been able to find to save an image to a particular folder is to use FileOutputStream, but that requires a byte array. I am not sure how to convert (if this is even the right way) from Bitmap to byte array, so I can use a Fileoutput stream to write the data.
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Jun 27, 2009
How can i save a Bitmap instance to a *.bmp file?Anyone knows? Is it strange that we can only save a bitmap instance to a png or jpg file?
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Apr 6, 2012
How can I save my volume level settings without losing them? when i reboot my phone, my volume levels return to default at a louder level. so how can i save my volume settings without adjusting them again after rebooting?
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Jul 24, 2010
I am a beginner Android developer and I need to know how to Save and Load images (Bitmaps) from the Android Gallery, But I dont even know where to start! Can someone help me to know where to get started, or even look?
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Jul 2, 2012
I'm having trouble developing an app, while it works in API level 10, it does not in API level 7. I wondery why and I've been looking for a site that summarizes the differences, or the new features from one API level to another and cannot find it.
09-04 04:24:21.485: E/AndroidRuntime(6834): Uncaught handler: thread main exiting due to uncaught exception
09-04 04:24:21.510: E/AndroidRuntime(6834): java.lang.VerifyError: [code]....
There seems to be a problem with an uncaught exception and reflection, although....why does it work on API level 10?
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Jul 21, 2010
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 think inSampleSize applies because I want to crop the image, not lower the resolution.
Uri data = getIntent().getData();
Input Stream is = getContentResolver().openInputStream(data);
Bitmap bitmap = BitmapFactory.decodeStream(is, null, null);
Any help would be great?
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Oct 8, 2009
I have two questions actually:
Is it better to draw an image on a bitmap or create a bitmap as resource and then draw it over a bitmap? Performance wise... which one is better?
If I want to draw something transparent over a bitmap, how would I go about doing it?
If I want to overlay one transparent bitmap over another, how would I do it?
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Mar 22, 2009
My goal is the draw a bitmap onto another bitmap but rotated 90 degress. whats the most efficient way to do that. My current method is as follows which is horribly bad because it creates a new bitmap every time.
CODE:.....................
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Jun 14, 2010
Does Android have a native library that can make a jpeg from binary data from say, a json object?
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Sep 29, 2010
Apparently you can't have a file in "assets" larger than 1MB (except for certain file types) because it's considered too large to uncompress. But I'm finding mixed info about how to circumvent this limitation. Some say that you can put the files in "raw" and avoid the limitation but others say that files in "raw" are compressed too.And there's the -0 aapt option that can be used to turn off compression for certain file types, but there's no way to specify aapt options in Carbide. I realize that I can break the file into pieces, but that's error- prone on both ends.And using one of the known uncompressed file types not only confuses things but also runs the risk that the Android PTB will decide to start compressing that file type.
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Jul 3, 2010
I want to download an image from the 'net and set it as the users background. This works great over wi-fi, and some 3G networks, but others (T-Mobile UK, for sure) seem to compress the images before sending them. This effect is noticeable when using the browser, too - however, if you long press on an image and save it, when viewing in the gallery it is either not compressed at all, or substantially less so. I want to be able to do this in my own app.I assume it has something to do with the HTTP headers, but of the ones I've modified, none has made a difference.
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Apr 13, 2009
I am confused on how to implement image processing algorithm on JPEG data.I have set P.setpicturesize (640,480) so the camera.takepicture (null,null,Imagecapture callbck) returns the image data. Void onPictureTaken(byte[] data, Camera Camera) returns JPEG data, but(x = data.length), the value of x is less than 640*480 bytes.Please kindly let me know how can I start editing pixel information of the image and image comparison algorithms.
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May 25, 2009
Anybody is having the knowledge on porting of our own codec with replacing the Android one.
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Sep 12, 2010
Does anyone know how to disable asset compression in eclipse builds? In other words, how to cause the -0 flag to be set on aapt?This is in order to put in a >1MB asset file, which requires compression to be turned off.
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Jun 22, 2010
I want to draw a shape(many circles particularly) into a Specific Bitmap. I have never used canvas / 2D graphs etc. As i see it i create a Drawable put the bitmap in it then "canvas-it" to the shapes i want etc.
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Apr 14, 2010
I manage a project where users upload JPEG images for processing. Generally the images are taken with Nikon cameras, but recently one user took images with a Droid and the client software did not recognize the Droid JPEG images for upload. The client software developer said it's because they read images written in the standard JPEG file interchange format (JFIF), and Droid JPEGs are not in this format. Why, and can this be corrected?
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Aug 14, 2009
I am developing an app in which i need the image in TIFF format.But in android u can convert your bitmap/image to only JPEG/png image. is there a way to convert JPEG/png file to TIFF format or is there any jar available to do so.
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Jun 20, 2010
So from what I can tell Media.insert Image is locked to heavy compression on all images. This includes when passing in the path to a photo in the filesystem. As a test I used a 3000x2000 pixel jpg which had been previously saved at maximum quality and was ~6MB. After passing the path to Media.insert Image, the resultant copy (still 3000x2000) is 623KB. I passed in another copy of the 3000x2000 image, this one compressed down to 393KB. After Media.insert Image, the image filesize is 492KB. I'm wondering if there's a way to specify the compression when images are saved by insert Image. I'm also wondering why this is recompressing jpgs, rather than simply copying them into DCIM. A side-effect of opening and re-compressing these images is that it imposes a rather low VM cap on what insert Image can handle. I'm getting out-of-memory errors when trying to pass the path of a 10 megapixel image.
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Oct 28, 2010
First i want to say im running the Redemptive rEVOlution rom and i dont know if this will work on roms with the incredible framework, i think it might.I installed a zip from Calkulin over on the xda evo forum for a compression fix for mms. If the pic is not over the size limit, it wont be compressed anymore. I have just sent about ten pics in a row ranging from 550kb up to 1.1mb and they all went through without compressing! I take no credit for the mod. All credit goes to calkulin over at xda.I found it very annoying that every pic would get compressed. Glad to find a fix for that. BIG. THANKS TO CALKULIN FOR THIS.Now when it does compress a message thats over the size limit, its still" over" compressing it. My limit is 1.2m and if the file is 1.3, it compress' to 44kb...What the hell? Just have to find out how to fix the over compression issue and im happier then a pig in shit.
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Aug 23, 2009
I would appreciate to hear from you what would be the available options in Android to perform a lossless jpeg rotation of a jpeg image -> Rearranging the image data from landscape to portrait by rotation without ever fully decoding the image. My problem is that my device's camera always take the images in landscape mode and sometimes I would need to rotate the image to portrait to be used in my application. This takes time and memory if I need to do it in the standard way (decode the image, apply rotation operation to the pixels and encode again). Doing it without decoding the image would bring a significant improvement in performance. I have seen that in Android platform (Cupcake) jpegtran.c (which performs this operation beautifully) is available under /external/jpeg but this functionality is not available (a.f.a.k) on the application framework. How can I use this function? I guess I need to use JNI to be able to access this functionality, right? Other ways? Could you give me any hint on how I could do this or if there is another easier and quicker way to do it?
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May 28, 2010
Can I have sub-folders to hold my drawable resources. For example can I store an image in, say, 'res/drawable/content/images/myimage.jpg' and then find that resource via a call to:
id = context.getResources().getIdentifier("com.mycompany.myprog:drawable/ content/images/myimage", null, null);
I have tried this and it doesn't seem to be working (but I may have something wrong). Is it supposed to work or do all the resources need to be in the root drawable folder? Also, are jpeg files supported and drawable resources?
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Aug 6, 2010
How can I convert from NV21 to JPEG. Currently, NV21 is the only previewFormat that is supported by the camera on a Nexus One (running Android 2.2).
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Aug 17, 2010
When I try to send a photo by MMS the phone compresses the image to 8kb when it can send up to 300kb, obviously the image quality is rubbish then.
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