python - pyqtgraph histogram LUT Item - how to change color? -


i want change color of blue bar in histogram.

i've changed color of background: 

.ui.histogram.setbackground(background= pg.mkcolor(37,37,37))

but don´t know how change color of blue bar. (i imported pyqtgraph pg)

does know how this?

thank in advance

it's hard me make answer i'm of, because don't have information. instance ui in question? next time please make mvce.

anyway, assuming have imageview object called imgview following should work:

alpha = 50 region = imgview.histogram.item.region region.setbrush(color=(255, 0, 0, alpha)) line in region.lines:     line.setpen(color=(255, 0, 0, 255))

make sure alpha smaller 128. value of 2 * alpha used when hover above region, , warning if exceeds 256.

by way, imgview.histogram.item histogramlutitem. got answer looking @ source code.


Comments

Post a Comment

Popular posts from this blog

Is there a better way to structure post methods in Class Based Views -

i'm using class based views in django , never specify url in ajax calls , omit action parameter in form because know these requests go through post method of class based view. notice view - profile page make many requests depending on user updating on page - post method become convoluted , if/else mess example: def post(self, request, *args, **kwargs): # handle user changing available date if request.post.get('availabledate') != none: self.updateavailabledate(request) return jsonresponse({'result':'success'}) if request.post.get('newprojectname') != none: creative_user = creativeuserprofile.objects.get(id = request.user.id) project = project.create_project(creative_user, request.post['newprojectname']) project.save() return jsonresponse({'projectid': project.id }) if request.post.get('projectimage') != none , request.files['file']: proj...
Read more

Python Tornado package error when running server -

we running tornado tcp server on windows server 2012 machine. machine handles both http-based dashboard , 21 tcp websocket connected clients. in logs see following error. seems @ low level of websocket13 protocol. networking standpoint mean? why write buffer not greater or equal 0? [error] [2017-08-17 11:54:14 am] [tornado.application] exception in callback <bound method websocketprotocol13.periodic_ping of <tornado.websocket.websocketprotocol13 object @ 0x01d7ad30>> traceback (most recent call last): file "c:\python27\lib\site-packages\tornado\ioloop.py", line 1026, in _run return self.callback() file "c:\python27\lib\site-packages\tornado\websocket.py", line 1030, in periodic_ping self.write_ping(b'') file "c:\python27\lib\site-packages\tornado\websocket.py", line 790, in write_ping self._write_frame(true, 0x9, data) file "c:\python27\lib\site-packages\tornado\websocket.py", line 768, in _writ...
Read more

Qt QGraphicsScene is not accessable from QGraphicsView (on Qt 5.6.1) -

i new qt. trying catch mouse press , release in qgraphicsview area , draw line. this, extended qgraphicsview , called myqgraphicsview . seems scene not attached since added " hello world " , never appears in view. here code extended class: class myqgraphicsview : public qgraphicsview { q_object public: myqgraphicsview(qgraphicsscene *scene, qwidget *parent = q_nullptr) : qgraphicsview(scene,parent){ // qgraphicsview::qgraphicsview(scene,parent); } qpoint *pointptr, *startpos,*endpos; qgraphicsview *cv;//maa qgraphicsscene *c; qgraphicsscene *sceneptr; // maa protected: void paintevent(qpaintevent *event) { show(); } void mousepressevent(qmouseevent *event) { // pos wrt widget. global wer global screen qdebug()<<" mouse pressed @ "<<qwidget::mapfromglobal(event->globalpos()); //globalx(); startpos = new qpoint; startpos->setx(qwidget::mapfromglobal(event->globalpos()).x()); startpos->sety(qw...
Read more