Re: [sanselan] Writing EXIF data to JPEG
We can safely conclude from this that there is many reasons why 1.0 needs to be released, and 0.97 needs to die :). I can agree to that. Now that you have helped me so immensely, I will try to repay you a little with some feedback on the project. I will be biased by the 0.97 version and the fact that all I wanted to do was to write some MetaData into a JPEG image on Android. == Tag creation == - Creating a tag at 0.97 is surprisingly difficult. - There is no javadoc on any of the tags - There is no clear-to-use examples (that I found) - Supplying a String to TiffOutputField.create(...) blows up, even on a Ascii type tag. (I know the SVN version fixes some of this) - Wanting to create the EXIF_TAG_CREATE_DATE, I need to create this from a String, however, there should be a method taking a java.util.Date class and formatting it correctly. This also applies to getting the date. - EXIF_TAG_XP* tags should automatically use the UTF18LE encoding on a String. - It would be nice to have a simply-to-use api on the OutputSet. For example outputset.setTag(EXIF_TAG_CREATE_DATE, new Date()). == Android support == I haven't actually used Sanselan directly, since I needed it to work on Android. Instead I used http://code.google.com/p/sanselanandroid/. This project is using version 0.97. It would be nice to have native Android support from Sanselan. I have seen several stackoverflow posts about using Sanselan on Android. Android does not support java.awt.*, so if the functionality used from there could be dropped, Android seems to be fully supported. == Website == - The website contains many dead links. - There should be more examples or help. == Generics == I know the project targeted Java 1.4, Sanselan only requires Java 1.4 or later., however I feel like generics would be a great upgrade. For example, when seeing an ArrayList in the project, you really have no idea what it contains unless there is some javadoc that tells you so. Hope this is useful. If I had the time, I would like to help. However, I am swamped at the moment. I want to say thank you once again. Thank you! /Kasper - To unsubscribe, e-mail: user-unsubscr...@commons.apache.org For additional commands, e-mail: user-h...@commons.apache.org
Re: [sanselan] Writing EXIF data to JPEG
Sorry about the website, I plan on fixing it with the 1.0 release. UserComment is one of the uglier cases, as it uses that GPS string type with a special prefix to distinguish character encodings. Try using TagInfo.Text's encodeValue() method to convert the String to byte[], then pass that to new TiffOutputField(ExifTagConstants.EXIF_TAG_USER_COMMENT, ExifTagConstants.EXIF_TAG_USER_COMMENT.fieldTypes, bytes.length, bytes); Thanks for the help, I can now save a usercomment and the artist field successfully. There is just one tiny little problem that I am now requesting some help for. I am able to put international characters into the artist and usercomment field, however, the usercomment field is not shown in Windows Explorer, but the artist is. I have been searching the internet and found that the byteorder should be little_endian, but that was the default case. Is there some way to put in internation characters in the usercomment field? Here is my current code. I altered yours a bit: TiffOutputSet set = new TiffOutputSet(TiffConstants.BYTE_ORDER_LITTLE_ENDIAN); byte[] bytesComment = ExifTagConstants.EXIF_TAG_USER_COMMENT.encodeValue(TiffFieldTypeConstants.FIELD_TYPE_ASCII, KasperCommentÅ, set.byteOrder); byte[] bytesAuthor = TiffTagConstants.TIFF_TAG_ARTIST.encodeValue(TiffFieldTypeConstants.FIELD_TYPE_ASCII, KasperAuthorÅ, set.byteOrder); TiffOutputField commentField = new TiffOutputField(ExifTagConstants.EXIF_TAG_USER_COMMENT, ExifTagConstants.EXIF_TAG_USER_COMMENT.dataTypes[0], bytesComment.length, bytesComment); TiffOutputField authorField = new TiffOutputField(TiffTagConstants.TIFF_TAG_ARTIST, TiffTagConstants.TIFF_TAG_ARTIST.dataTypes[0], bytesAuthor.length, bytesAuthor); set.getOrCreateExifDirectory().add(commentField); set.getOrCreateRootDirectory().add(authorField); Thanks on beforehand, and thanks for the help so far! /Kasper - To unsubscribe, e-mail: user-unsubscr...@commons.apache.org For additional commands, e-mail: user-h...@commons.apache.org
Re: [sanselan] Writing EXIF data to JPEG
I wouldn't count on Windows Explorer to give you the right values. Rather check it against exiftool (www.sno.phy.queensu.ca/~phil/exiftool/): exiftool -a -g1 -u image.tiff Windows Explorer also likes the XP values (eg. EXIF_TAG_XPCOMMENT, EXIF_TAG_XPAUTHOR), maybe try writing those as well? Damjan Sorry for asking so many questions :( I hope it is okay. Hmm. It does not seem like the XP values work. They do not show correctly. Anyways, I tried using the code I sent you without special characters: byte[] bytesComment = ExifTagConstants.EXIF_TAG_USER_COMMENT.encodeValue(TiffFieldTypeConstants.FIELD_TYPE_ASCII, KasperComment, set.byteOrder); byte[] bytesAuthor = TiffTagConstants.TIFF_TAG_ARTIST.encodeValue(TiffFieldTypeConstants.FIELD_TYPE_ASCII, KasperAuthor, set.byteOrder); TiffOutputField commentField = new TiffOutputField(ExifTagConstants.EXIF_TAG_USER_COMMENT, ExifTagConstants.EXIF_TAG_USER_COMMENT.dataTypes[0], bytesComment.length, bytesComment); TiffOutputField authorField = new TiffOutputField(TiffTagConstants.TIFF_TAG_ARTIST, TiffTagConstants.TIFF_TAG_ARTIST.dataTypes[0], bytesAuthor.length, bytesAuthor); set.getOrCreateExifDirectory().add(commentField); set.getOrCreateRootDirectory().add(authorField); Then the exif tools shows (and so do windows explorer): IFD0 Artist : KasperAuthor ExifIFD User Comment: KasperComment JFIF JFIF Version: 1.01 However, trying the same, but adding an å to KasperComment and KasperAuthor gives the following: IFD0 Artist : KasperAuthorå ExifIFD User Comment: 䭡獰敲䍯浭敮瓃 JFIF JFIF Version: 1.01 It seems the UserComment has been destroyed. Now it is suddenly chinese characters!? Windows explorer shows the artist but not the usercomment. Is this something to do with ExifDirectory vs RootDirectory? /Kasper - To unsubscribe, e-mail: user-unsubscr...@commons.apache.org For additional commands, e-mail: user-h...@commons.apache.org
Re: [sanselan] Writing EXIF data to JPEG
Windows Explorer also likes the XP values (eg. EXIF_TAG_XPCOMMENT, EXIF_TAG_XPAUTHOR), maybe try writing those as well? Hmm. You seem to be right that explorer likes the XP values. However, I can't figure out how to write to them. I can see that they are BYTE values, but how to convert a string into the wanted bytes? This is the result I get: IFD0 XP Comment : 態灳牥潃浭湥t XP Author : 態灳牥畁桴牯 With this code: byte[] bytesComment = ExifTagConstants.EXIF_TAG_XPCOMMENT.encodeValue(TiffFieldTypeConstants.FIELD_TYPE_ASCII, KasperComment, set.byteOrder); byte[] bytesAuthor = ExifTagConstants.EXIF_TAG_XPAUTHOR.encodeValue(TiffFieldTypeConstants.FIELD_TYPE_ASCII, KasperAuthor, set.byteOrder); TiffOutputField commentField = new TiffOutputField(ExifTagConstants.EXIF_TAG_XPCOMMENT, ExifTagConstants.EXIF_TAG_XPCOMMENT.dataTypes[0], bytesComment.length, bytesComment); TiffOutputField authorField = new TiffOutputField(ExifTagConstants.EXIF_TAG_XPAUTHOR, ExifTagConstants.EXIF_TAG_XPAUTHOR.dataTypes[0], bytesAuthor.length, bytesAuthor); set.getOrCreateRootDirectory().add(commentField); set.getOrCreateRootDirectory().add(authorField); /Kasper - To unsubscribe, e-mail: user-unsubscr...@commons.apache.org For additional commands, e-mail: user-h...@commons.apache.org
Re: [sanselan] Writing EXIF data to JPEG
On 07-03-2012 06:37, Damjan Jovanovic wrote: On Wed, Mar 7, 2012 at 12:46 AM, Kasper Fønskfo...@gmail.com wrote: Hi Sanselan. I have a hard time finding out how to use Sanselan. Suppose I have some JPEG picture which I want to add some attributes to. If for example I want to add some user comment or date I try this: TiffOutputSet outputSet = new TiffOutputSet(); TiffOutputField dateTaken = TiffOutputField.create(TiffConstants.EXIF_TAG_CREATE_DATE, outputSet.byteOrder, 2003:03:29 17:47:50); TiffOutputField comment = TiffOutputField.create(TiffConstants.EXIF_TAG_IMAGE_DESCRIPTION, outputSet.byteOrder, This is a test!); However, both of these fails on unexpected data type. If I am not supposed to give a String, then what I am supposed to supply? I hope you can help with these, probably noobish questions. /Kasper That TiffOutputField.create() was a horribly broken API that I've eliminated in the latest SVN, and replaced with a new, beautiful, type safe, code completable, byte order independent TiffOutputDirectory.add() API. I recommend you use the latest SVN, or wait for the 1.0 release in a few weeks. If you really must use version 0.97, I think the only way to get strings to work is to convert the string to bytes with getBytes(), null-terminate those yourself, then pass them to the low-level constructor new TiffOutputField(...). Damjan Hi again Damjan. Thanks for the response. I have had a look at the new API, and it looks cleaner. I want to run this on Android, and I can see that there is a heavy dependency on java.awt, which unfortunately is not in Android. Do you have some hints as what to do? /Kasper - To unsubscribe, e-mail: user-unsubscr...@commons.apache.org For additional commands, e-mail: user-h...@commons.apache.org
Re: [sanselan] Writing EXIF data to JPEG
On 07-03-2012 19:41, Damjan Jovanovic wrote: On Wed, Mar 7, 2012 at 8:07 PM, Kasper Fønskfo...@gmail.com wrote: On 07-03-2012 06:37, Damjan Jovanovic wrote: On Wed, Mar 7, 2012 at 12:46 AM, Kasper Fønskfo...@gmail.comwrote: Hi Sanselan. I have a hard time finding out how to use Sanselan. Suppose I have some JPEG picture which I want to add some attributes to. If for example I want to add some user comment or date I try this: TiffOutputSet outputSet = new TiffOutputSet(); TiffOutputField dateTaken = TiffOutputField.create(TiffConstants.EXIF_TAG_CREATE_DATE, outputSet.byteOrder, 2003:03:29 17:47:50); TiffOutputField comment = TiffOutputField.create(TiffConstants.EXIF_TAG_IMAGE_DESCRIPTION, outputSet.byteOrder, This is a test!); However, both of these fails on unexpected data type. If I am not supposed to give a String, then what I am supposed to supply? I hope you can help with these, probably noobish questions. /Kasper That TiffOutputField.create() was a horribly broken API that I've eliminated in the latest SVN, and replaced with a new, beautiful, type safe, code completable, byte order independent TiffOutputDirectory.add() API. I recommend you use the latest SVN, or wait for the 1.0 release in a few weeks. If you really must use version 0.97, I think the only way to get strings to work is to convert the string to bytes with getBytes(), null-terminate those yourself, then pass them to the low-level constructor new TiffOutputField(...). Damjan Hi again Damjan. Thanks for the response. I have had a look at the new API, and it looks cleaner. I want to run this on Android, and I can see that there is a heavy dependency on java.awt, which unfortunately is not in Android. Do you have some hints as what to do? /Kasper No, sorry, Android isn't supported at the moment. There is a fork (http://code.google.com/p/sanselanandroid/) which supposedly lets you do EXIF on Android, but I've never tried it. Damjan Hi again again. So, the android port is using 0.97 unfortunately, so I can't make use of your nice API. Is it possible that you could show me with an example, how I would write the tag UserComment using 0.97? Do you have some samples I can look at? Also, the website seems to contain a lot of dead links. /Kasper - To unsubscribe, e-mail: user-unsubscr...@commons.apache.org For additional commands, e-mail: user-h...@commons.apache.org
[sanselan] Writing EXIF data to JPEG
Hi Sanselan. I have a hard time finding out how to use Sanselan. Suppose I have some JPEG picture which I want to add some attributes to. If for example I want to add some user comment or date I try this: TiffOutputSet outputSet = new TiffOutputSet(); TiffOutputField dateTaken = TiffOutputField.create(TiffConstants.EXIF_TAG_CREATE_DATE, outputSet.byteOrder, 2003:03:29 17:47:50); TiffOutputField comment = TiffOutputField.create(TiffConstants.EXIF_TAG_IMAGE_DESCRIPTION, outputSet.byteOrder, This is a test!); However, both of these fails on unexpected data type. If I am not supposed to give a String, then what I am supposed to supply? I hope you can help with these, probably noobish questions. /Kasper - To unsubscribe, e-mail: user-unsubscr...@commons.apache.org For additional commands, e-mail: user-h...@commons.apache.org
