graphics - Using Java AWT to generate monochrome 1bitpp PNG with Ancillary Chunks -

-

i trying generate png following ancillary chunks (header reference image) enter image description here

the ancillary chunks in reference image came gimp processing.

whereas image generate java awt not have ancillary chunks.
here header of png generating. please note critical chunks identical.

enter image description here

here code fragment

{         :          // color map contains colors black , white         byte[] cmap = {0, 0, 0, (byte)255, (byte)255, (byte)255};         // create indexcolormodel setting white transparent color         indexcolormodel monochrome = new indexcolormodel(8, 2, cmap, 0, false, 0);         bufferedimage img = new bufferedimage(width_img, height_img,                   bufferedimage.type_byte_indexed,monochrome);         graphics2d g2d = img.creategraphics();          :                     g2d.setcolor(color.white);         g2d.fillrect(0, 0, width_img, height_img);          font font = new font("arial bold", font.plain, 48);         g2d.setfont(font);         fontmetrics fm = g2d.getfontmetrics();         g2d.setcolor(color.black);         :         :          g2d.dispose();          imgname = ".\\panel"+width_img+"x"+height_img+".png";         imageio.write(img, "png", new file(imgname));        : }

how add chunks (phys, time) using java awt?

any pointers helpful too- please let me know.

thank you

i concluded awt not support - questions identifies couple of ways add chunks how can save png text or itxt chunk java?

here propose -

use awt / graphics 2d generate .png

read png, refer link details on how

add chunks want add

write it(them) .png


Comments

Post a Comment

Popular posts from this blog

PHP DOM loadHTML() method unusual warning -

-
i had following code works fine on localhost: $document = new domdocument(); $document->loadhtml($p_result); $form = $document->getelementsbytagname('form')->item(0); // code continues using $form variable after same code updated on outside server, loadhtml() failed , issued warning. warning: domdocument::loadhtml() expects parameter 1 valid path, string given in path/name/to/script.php returned null instead of object code pretty gets fatal error. note contents of $p_result absolutely same on outside server , on localhost. but why displays kind of warning , why not work? doesn't loadhtml() expects argument 1 string in first place? why method expects parameter 1 valid path ? just make clear i'm not calling loadhtmlfile() , i'm calling loadhtml() . thanks. you're affected one of php bugs . issue present in php 5.6.8 , 5.6.9. have affected php version on server, , bug-free version on localhost. the bug forbids null
Read more

python - How to create jsonb index using GIN on SQLAlchemy? -

-
here's current code creating index jsonb. index("mytable_data_idx_id_key", mytable.data['id'].astext, postgresql_using='gin') but got error. sqlalchemy.exc.programmingerror: (psycopg2.programmingerror) data type text has no default operator class access method "gin" hint: must specify operator class index or define default operator class data type. [sql: "create index event_data_idx_id_key on event using gin ((data ->> 'id'))"] is there way create index on sqlalchemy? the postgresql specific sqlalchemy docs @ http://docs.sqlalchemy.org/en/latest/dialects/postgresql.html#operator-classes mention postgresql_ops dictionary provide "operator class" used postgresql, , provide example illustrating use: index('my_index', my_table.c.id, my_table.c.data, postgresql_ops={ 'data': 'text_pattern_ops',
Read more

c# - TransactionScope not rolling back although no complete() is called -

-
i'm using transactionscope rollback transaction fail bool errorreported = false; action<importerrorlog> newerrorcallback = e => { errorreported = true; errorcallback(e); }; using (var transaction = new transactionscope()) { foreach (importtaskdefinition task in taskdefinition) { loader.load(streamfile, newerrorcallback, task.destinationtable, processingtaskid); } if (!errorreported) transaction.complete(); } i'm sure there no transactionscope started ahead or after code. i'm using entity framework insert in db. regardless state of errorreported transaction never rolled in case of error. what missing ? transactionscope sets transaction.current . that's does. wants transacted must @ property. i believe ef each time connection opened reason. probably, connection open when scope installed. open connection inside of scope or enlist manually. ef has nasty "design decision": default opens
Read more