java - Android: Resizing Bitmaps without losing quality -


i've searched through on entire web before posting. problem cannot resize bitmap without losing quality of image (the quality bad , pixelated).

i take bitmap camera , have downscale it, can upload server faster.

this function sampling

public bitmap resizebitmap(bitmap bitmap){          canvas canvas = new canvas();          bitmap resizedbitmap = null;          if (bitmap !=null) {                 int h = bitmap.getheight();                 int w = bitmap.getwidth();                 int newwidth=0;                 int newheight=0;                  if(h>w){                     newwidth = 600;                     newheight = 800;                 }                  if(w>h){                     newwidth = 800;                     newheight = 600;                     }                  float scalewidth = ((float) newwidth) / w;                 float scaleheight = ((float) newheight) / h;                    matrix matrix = new matrix();                 // resize bit map                 matrix.prescale(scalewidth, scaleheight);                  resizedbitmap  = bitmap.createbitmap(bitmap, 0, 0, w, h, matrix, true);                    paint paint = new paint();                 paint.setantialias(true);                 paint.setfilterbitmap(true);                 paint.setdither(true);                  canvas.drawbitmap(resizedbitmap, matrix, paint);                }           return resizedbitmap;

and how image activity result

 protected void onactivityresult(int requestcode, int resultcode,              intent data) {          if(resultcode != result_canceled){           if (requestcode == 0) {              if (resultcode == result_ok) {                       getcontentresolver().notifychange(mimageuri, null);                     contentresolver cr = this.getcontentresolver();                      try                     {                         b = android.provider.mediastore.images.media.getbitmap(cr, mimageuri);                         log.d("foto", integer.tostring(b.getwidth()));                         log.d("foto", integer.tostring(b.getheight()));                         addphoto.setimagebitmap(b);                      }                     catch (exception e)                     {                         toast.maketext(this, "failed load", toast.length_short).show();                         log.d("tag", "failed load", e);                     }                 }          }

i'm starting think best way small picture size set camera resolution. else can help?

try bitmap.createscaledbitmap. has option filter source.


Comments

Post a Comment

Popular posts from this blog

linux - xterm copying to CLIPBOARD using copy-selection causes automatic updating of CLIPBOARD upon mouse selection -

i've tried various ways coerce xterm (versions 285 , 292) copy selection clipboard clipboard whenever press ctrl-shift-c. promising way far has been, in ~/.xresources, put this: xterm*vt100.translations: #override \ ctrl shift <keypress> c: copy-selection(clipboard) \n\ ctrl shift <keypress> v: insert-selection(clipboard) ctrl-shift-v works perfectly, copying has nuance... if restart xterm, highlighting text puts things in primary clipboard; expected, proper, default behavior. if hit ctrl-shift-c, copies current selection clipboard clipboard. the bug, however, if highlight text after first time pressed ctrl-shift-c, you'll see highlighting copies both primary and clipboard. cannot figure out how stop xterm updating clipboard upon selection... , doesn't make sense me in first place. i said, @ specific point in time, copy selection clipboard... yet starts updating automatically upon selection after doing once... anyone have workaround...
Read more

c++ - qgraphicsview horizontal scrolling always has a vertical delta -

Image
i've subclassed qgraphicsview custom canvas used in cad application. i've reimplemented qgraphicsview::wheelevent check keyboard modifiers control key and, if control key pressed, zoom. i'm trying implement horizontal scroll when user holds shift , uses wheel. the problem i'm having horizontal scrolling always scrolls 0.279. not huge problem, hugely annoying , points else being wrong. so, here questions: is right way implement horizontal scrolling? if not, is? how eliminate delta of 0.279? thanks in advance. code , sample output below void myview::zoom(int delta) { double factor = pow(1.2, delta/abs(delta)); this->scale(factor, factor); } void myview::scrollhorizontal(int level) { qpointf center = maptoscene(viewport()->rect().center()); qdebug() << "center: " << center.x() << ", " << center.y(); centeron(qpointf(center.x() - level, center.y())); } void myview::wheelevent(qwheeleve...
Read more