我无法获得ImageReaderByFormatName（“jpeg-lossless”） [英] I can't get an ImageReaderByFormatName("jpeg-lossless")

问题描述

我正在尝试使用JAI_ImageIO库和以下java调用解码无损jpeg：

I am trying to decode a lossless jpeg using JAI_ImageIO library and the following java call:

ImageIO.getImageReadersByFormatName("jpeg-lossless").hasNext()

结果为null。

注意：我的jre / lib / ext目录中安装了JAI_ImageIO jar。

NOTE: I have the JAI_ImageIO jar installed to my jre/lib/ext directory.

我不知道JPEG阅读器是否是足以读取无损jpeg或者是否需要安装其他阅读器。

I don't know if the JPEG reader is sufficient to read lossless jpegs or if another reader is required to be installed.

当我枚举FormatNames时，即：

When I enumerate the FormatNames, i.e.:

ImageIO.getReaderFormatNames()

我得到以下信息格式：

[raw, jpeg, tif, WBMP, PNM, JPG, DICOM, wbmp, JPEG, PNG, jpeg 2000, 
tiff, BMP, JPEG2000, RAW, jpeg2000, GIF, TIF, TIFF, jpg, bmp, pnm, 
png, JPEG 2000, gif]

当我尝试使用JPEG2000阅读器时，我得到以下运行时异常：

I get the following runtime exception when I try to use the JPEG2000 reader:

java.lang.RuntimeException: File is neither valid JP2 file nor valid JPEG 2000 codestream
at com.sun.media.imageioimpl.plugins.jpeg2000.J2KReadState.initializeRead(J2KReadState.java:696)
at com.sun.media.imageioimpl.plugins.jpeg2000.J2KReadState.<init>(J2KReadState.java:209)
at com.sun.media.imageioimpl.plugins.jpeg2000.J2KImageReader.read(J2KImageReader.java:449)
at javax.imageio.ImageReader.read(ImageReader.java:940)

当我尝试

ImageIO.read(file)

直接我得到一个org.dcm4cheri.image.ConfigurationException。

directly I get a an org.dcm4cheri.image.ConfigurationException.

推荐答案

好的，我找到了我的特定问题的答案，我相信它将解决如何至少在基于* NIX的操作系统上正确安装JAI_ImageIO的更普遍的问题。

OK, I found the answer to my particular problem and I believe it will solve the more general problem of how to install JAI_ImageIO properly at least on *NIX based operating system.

阅读以下内容后（ WWW上的模糊位置）并尝试JAI_ImageIO的所有3种安装选择描述了此处。 （我还应该提到我在Debian 6.0 64位平台上运行。）

After reading the following (Obscure place on the WWW) and attempting all 3 installation alternatives of JAI_ImageIO described here. (I should've also made mention that I am running on a Debian 6.0 64bit platform.)

使用 manual 安装类型我意识到我的LD_LIBRARY_PATH变量没有被选中向上。所以我决定强制解决这个问题，并在我的/ usr / lib中添加一个到libclib_jiio.so的软链接。瞧，它看起来有效。

After settling with the manual "installation type" I realized that my LD_LIBRARY_PATH variable wasn't being picked up. So I decided to force the issue and add a soft link to the libclib_jiio.so in my /usr/lib. Lo and behold it worked.

我使用了提供的代码此处确定我的JAI_ImageIO是否安装正确，以及如果安装正确，你应该在输出中看到JPEG-LOSSLESS格式/提供商！

I used the code provided here to determine if my JAI_ImageIO was installed properly, and when it is installed properly you should see a "JPEG-LOSSLESS" formats/providers in the output!

感谢您的建议。我将尝试扩展问题，使其更加通用于安装JAI_ImageIO pro的问题

Thanks for the suggestions. I will try to expand the question to make it more general to the problem of installing JAI_ImageIO pro

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