Java konwertowanie obrazu do BufferedImage
Jest już takie pytanie link na StackOverflow i akceptowana odpowiedź to "casting":
Image image = ImageIO.read(new File(file));
BufferedImage buffered = (BufferedImage) image;
W moim programie staram się:
final float FACTOR = 4f;
BufferedImage img = ImageIO.read(new File("graphic.png"));
int scaleX = (int) (img.getWidth() * FACTOR);
int scaleY = (int) (img.getHeight() * FACTOR);
Image image = img.getScaledInstance(scaleX, scaleY, Image.SCALE_SMOOTH);
BufferedImage buffered = (BufferedImage) image;
Niestety dostaję błąd run time:
Oczywiście casting nie działa.Sun.awt.obraz.ToolkitImage nie może być wrzucany do Javy.awt.obraz.BufferedImage
Pytanie brzmi: jaki jest (lub jest) właściwy sposób konwersji obrazu na obraz BufferedImage?
60
4 answers
/**
* Converts a given Image into a BufferedImage
*
* @param img The Image to be converted
* @return The converted BufferedImage
*/
public static BufferedImage toBufferedImage(Image img)
{
if (img instanceof BufferedImage)
{
return (BufferedImage) img;
}
// Create a buffered image with transparency
BufferedImage bimage = new BufferedImage(img.getWidth(null), img.getHeight(null), BufferedImage.TYPE_INT_ARGB);
// Draw the image on to the buffered image
Graphics2D bGr = bimage.createGraphics();
bGr.drawImage(img, 0, 0, null);
bGr.dispose();
// Return the buffered image
return bimage;
}
85
Author: Sri Harsha Chilakapati,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2015-05-28 04:50:28
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2015-05-28 04:50:28
Jednym ze sposobów radzenia sobie z tym jest utworzenie nowego obrazu BufferedImage i wskazanie, że obiekt graficzny rysuje skalowany obraz do nowego obrazu BufferedImage:
final float FACTOR = 4f;
BufferedImage img = ImageIO.read(new File("graphic.png"));
int scaleX = (int) (img.getWidth() * FACTOR);
int scaleY = (int) (img.getHeight() * FACTOR);
Image image = img.getScaledInstance(scaleX, scaleY, Image.SCALE_SMOOTH);
BufferedImage buffered = new BufferedImage(scaleX, scaleY, TYPE);
buffered.getGraphics().drawImage(image, 0, 0 , null);
To powinno wystarczyć bez rzucania. 18
Author: salbeira,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2012-11-28 12:51:08
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2012-11-28 12:51:08
Jeśli odzyskujesz sun.awt.image.ToolkitImage
, możesz rzucić obraz do tego, a następnie użyć getBufferedImage () , aby uzyskać BufferedImage
.
Więc zamiast ostatniej linijki kodu, w którym rzucasz, po prostu zrób:
BufferedImage buffered = ((ToolkitImage) image).getBufferedImage();
2
Author: Hermann Hans,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2012-11-28 12:47:58
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2012-11-28 12:47:58
Jeśli używasz Kotlina, możesz dodać metodę rozszerzenia do obrazu w taki sam sposób, jak sugeruje Sri Harsha Chilakapati.
fun Image.toBufferedImage(): BufferedImage {
if (this is BufferedImage) {
return this
}
val bufferedImage = BufferedImage(this.getWidth(null), this.getHeight(null), BufferedImage.TYPE_INT_ARGB)
val graphics2D = bufferedImage.createGraphics()
graphics2D.drawImage(this, 0, 0, null)
graphics2D.dispose()
return bufferedImage
}
I użyj go tak:
myImage.toBufferedImage()
2
Author: Steven Spungin,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2017-11-27 12:42:35
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2017-11-27 12:42:35