and if I look here:
http://www.mkyong.com/java/how-to-write-an-image-to-file-imageio/
I see this example:
ImageIO.write(image, "jpg",new File("C:\\out.jpg"));
ImageIO.write(image, "gif",new File("C:\\out.gif"));
ImageIO.write(image, "png",new File("C:\\out.png"));
None of those formatting strings have a period in them. And yet when I
remove the period from my extension, I get an error. And even with it,
nothing happens and nothing gets written to disk.
On Thursday, February 27, 2014 5:04:50 PM UTC-5, larry google groups wrote:
>
> I wanted to see what Format strings I am allowed, so at the repl:
>
>
> user> (import 'javax.imageio.ImageIO)
> javax.imageio.ImageIO
>
> user> (require '[clojure.pprint :as pp])
>
> user> (pp/pprint (javax.imageio.ImageIO/getReaderFormatNames))["BMP",
> "bmp", "jpg", "JPG", "wbmp", "jpeg", "png", "JPEG", "PNG", "WBMP", "GIF",
> "gif"]
>
> (fs/extension) was returning ".JPG" with a period. I thought that might be
> the problem so I removed it:
>
> (defn make-thumbnail [filename path-to-new-file-including-file-name width]
> {:pre [(= (type filename) java.lang.String)
> (fs/exists? filename)
> (= (type path-to-new-file-including-file-name) java.lang.String)
> (number? width)]}
> (println " we will write thumbnails to here: " (str
> path-to-new-file-including-file-name))
> (let [ext (st/replace (fs/extension filename) #"\." "")
> img (get-file-as-image filename)
> imgtype (java.awt.image.BufferedImage/TYPE_INT_ARGB)
> width (min (.getWidth img) width)
> height (* (/ width (.getWidth img)) (.getHeight img))
> simg (java.awt.image.BufferedImage. width height imgtype)
> g (.createGraphics simg)]
> (.drawImage g img 0 0 width height nil)
> (.dispose g)
> (pp/pprint simg)
> (println "the extension we use:")
> (pp/pprint ext)
> (javax.imageio.ImageIO/write simg ext (io/as-file
> path-to-new-file-including-file-name))))
>
> So the final println gives me:
>
> the extension we use:
> "JPG"
>
> and yet now I get:
>
> Exception in thread "Thread-1" javax.imageio.IIOException: Invalid
> argument to native writeImage
> at com.sun.imageio.plugins.jpeg.JPEGImageWriter.writeImage(Native Method)
>
> which is surprising since the Format string, without the period, should be
> more correct.
>
>
>
>
>
> On Thursday, February 27, 2014 4:47:31 PM UTC-5, larry google groups wrote:
>>
>>
>> Hmm, I made it a little further. Now I am trying to write a thumbnail to
>> disk. I have copied the code from StackOverflow. I am using this function:
>>
>> (defn make-thumbnail [filename path-to-new-file-including-file-name width]
>> {:pre [(= (type filename) java.lang.String)
>> (fs/exists? filename)
>> (= (type path-to-new-file-including-file-name) java.lang.String)
>> (number? width)]}
>> (println " we will write thumbnails to here: " (str
>> path-to-new-file-including-file-name))
>> (let [ext (fs/extension filename)
>> img (get-file-as-image filename)
>> imgtype (java.awt.image.BufferedImage/TYPE_INT_ARGB)
>> width (min (.getWidth img) width)
>> height (* (/ width (.getWidth img)) (.getHeight img))
>> simg (java.awt.image.BufferedImage. width height imgtype)
>> g (.createGraphics simg)]
>> (.drawImage g img 0 0 width height nil)
>> (.dispose g)
>> (pp/pprint simg)
>> (javax.imageio.ImageIO/write simg ext (io/as-file
>> path-to-new-file-including-file-name))))
>>
>>
>> This line:
>>
>> (println " we will write thumbnails to here: " (str
>> path-to-new-file-including-file-name))
>>
>> shows me this, which is the path I want:
>>
>> we will write thumbnails to here:
>>
>> /Users/larry/tma_files/processed/b5838394-a86c-411f-b556-94b30c26a553IMG_1175_180.JPG
>>
>> This line:
>>
>> (pp/pprint simg)
>>
>> gives me:
>>
>> #<BufferedImage BufferedImage@7ac84a5b: type = 2 DirectColorModel:
>> rmask=ff0000 gmask=ff00 bmask=ff amask=ff000000 IntegerInterleavedRaster:
>> width = 125 height = 93 #Bands = 4 xOff = 0 yOff = 0 dataOffset[0] 0>
>>
>> I do not get any errors or exceptions, but nothing gets written to disk.
>> Can anyone suggest why?
>>
>> If I look here:
>>
>> http://docs.oracle.com/javase/7/docs/api/javax/imageio/ImageIO.html#write(java.awt.image.RenderedImage,
>>
>> java.lang.String, java.io.File)
>>
>> Writes an image using an arbitrary ImageWriter that supports the given
>> format to a File. If there is already a Filepresent, its contents are
>> discarded.
>> Parameters:im - a RenderedImage to be written.formatName - a String containg
>> the informal name of the format.output - a File to be written to.Returns:
>> false if no appropriate writer is found.
>>
>> I am unsure what "false if no appropriate writer is found" means. I have
>> added code to be sure that only jpeg, gif and png files get to this
>> function.
>>
>> Any suggestions why nothing gets written to disk?
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> On Thursday, February 27, 2014 4:09:10 PM UTC-5, larry google groups
>> wrote:
>>>
>>>
>>> Ah, I see what happened. There was a Microsoft Word document in my
>>> folder of images. It was causing the problems. I had no error handling for
>>> non-images.
>>>
>>>
>>>
>>> On Thursday, February 27, 2014 3:52:09 PM UTC-5, Aaron Cohen wrote:
>>>>
>>>> On Thu, Feb 27, 2014 at 3:44 PM, larry google groups <
>>>> lawrenc...@gmail.com> wrote:
>>>>
>>>>> I tried this too:
>>>>>
>>>>> (ns tma-make-thumbnails.make-images
>>>>> (:import
>>>>> (java.util UUID)
>>>>> (javax.imageio ImageIO)
>>>>> (java.awt.image BufferedImage)
>>>>> (javax.imageio ImageReader))
>>>>>
>>>>>
>>>>>
>>>>> (defn get-file-as-image [filename]
>>>>> {:pre [(= (type filename) java.lang.String)
>>>>> (fs/exists? filename)
>>>>> (fs/file? (io/as-file filename))]
>>>>> :post [(do (pp/pprint %) true)
>>>>> (= (type %) java.awt.image.BufferedImage)]}
>>>>> (.read ImageIO (io/as-file filename)))
>>>>>
>>>>
>>>> This is trying to invoke the "read" method of the Class instance
>>>> representing "javax.imageio.ImageIO". This is surely not what you want.
>>>>
>>>>
>>>>> but that only gives me:
>>>>>
>>>>> Exception in thread "Thread-1" java.lang.IllegalArgumentException: No
>>>>> matching method found: read for class java.lang.Class
>>>>>
>>>>> I don't get why ImageIO is java.lang.Class after I imported it.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On Thursday, February 27, 2014 3:09:53 PM UTC-5, larry google groups
>>>>> wrote:
>>>>>>
>>>>>> I have no background with Java so I tend to suffer pain when dealing
>>>>>> with it. I am trying to create a thumbnail for an image, but my code
>>>>>> dies
>>>>>> on the :post assertion of this function:
>>>>>>
>>>>>> (defn get-file-as-image [filename]
>>>>>> {:pre [(= (type filename) java.lang.String)
>>>>>> (fs/exists? filename)
>>>>>> (fs/file? (io/as-file filename))]
>>>>>> :post [(do (pp/pprint %) true)
>>>>>> (= (type %) BufferedImage)]}
>>>>>> (javax.imageio.ImageIO/read (io/as-file filename)))
>>>>>>
>>>>>
>>>>
>>>> This is the correct syntax for invoking a static method of a class. I'm
>>>> not sure why it's not working for you. What kind of file are you trying to
>>>> load?
>>>>
>>>>
>>>
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