# Trouble using send\_data to stream image to browser

**URL:** <https://www.ruby-forum.com/t/trouble-using-send-data-to-stream-image-to-browser/134882>\
**Category:** Rails\
**Created:** [April 15, 2008, 10:55pm UTC](https://www.ruby-forum.com/t/trouble-using-send-data-to-stream-image-to-browser/134882 "2008-04-15T22:55:59Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![jlesleyball](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/48db29/32.png) [@jlesleyball](https://www.ruby-forum.com/u/jlesleyball)\
**Post date:** [April 15, 2008, 10:55pm UTC](https://www.ruby-forum.com/t/trouble-using-send-data-to-stream-image-to-browser/134882/1 "2008-04-15T22:55:59Z")

</div>

Hi

I’m doing some server-side graphics with Java2D and I’m trying to  
stream the resulting image to the browser using send\_data. When I try  
to view the image that I streamed, the browser just shows the URL in  
the window as a very small image (about .4 kb) when I am using jpeg  
format. For png, it tells me that the image has errors and can’t load  
it.

Here’s what I’m doing in the controller:

def sendImage  
biFiltered = BI.new(100, 100, BI::TYPE\_INT\_RGB)  
big = biFiltered.createGraphics()  
$w = 0  
$h = 0  
begin  
filename = “#{RAILS\_ROOT}/public/images/kids.jpg”  
imagefile = java.io.File.new(filename)  
bi = javax.imageio.ImageIO.read(imagefile)  
w = bi.getWidth(nil);  
h = bi.getHeight(nil);  
$stderr.print “after getting size”  
if bi.getType != BI.TYPE\_INT\_RGB  
bi2 = BI.new(w, h, BI::TYPE\_INT\_RGB)  
$stderr.print “before get graphics”  
big = bi2.createGraphics()  
$stderr.print “after getting graphics”  
big.drawImage(biFiltered, 0, 0, nil)  
bi = b2  
biFiltered = bi  
end  
rescue  
$stderr.print “Couldn’t load file”  
end

# big.drawImage(biFiltered, 0, 0, w, h, w/0.7, w/0.7, nil)

```
    big.drawImage(biFiltered,

```

java.awt.geom.AffineTransform.getScaleInstance(2, 2), nil)  
os = java.io.ByteArrayOutputStream.new  
begin  
isWritten = javax.imageio.ImageIO.write(biFiltered,  
“jpeg”, os)  
rescue  
$stderr.print “Couldn’t write file”  
end

```
    if isWritten

```

#send\_data , :type =\> “image/jpeg”, :disposition =\>  
“inline”, :filename =\> newkids.jpg

```
       send_data "os.toByteArray", :type => "image/

```

jpeg", :disposition =\> “inline”, :filename =\> “scaledkids.jpg”