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Image Catalogue Application

5 Navigation

5.1 Viewing Catalogued Images

In order to view images you first have to open the catalogue that is a collection of albums.

5.1.1 Displaying a Catalogue

Thumbcat remembers all the catalogues that have been accessed and these are listed for opening in the submenu of the iconbar menu item "Open Catalogue".

Catalogues can also be displayed by double clicking on the catalogue descriptor from a RiscOS filer window. When the cursor is moved over the catalogue entries i.e. album list it will change to a small arrow with a red or green rectangle attached to it. The red version indicates an album with no images whereas a green one indicates the album has images. The catalogue view looks like (book style) :

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5.1.2 Displaying an Album

An album is displyed by double clicking on an entry in the catalogue display. An album view (book style) looks like:

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If the book style option has been selected the album is displayed in pages which can be "turnd" by pressing on the curled corner at the bottom left and bottom right of the book view. Both book style and filer style views show three icons:

nochange.gif - 989 bytes  or  change.gif - 978 bytes   Indicates that the images in the album are read-only or read-write.

linked.gif - 979 bytes  or  unlinked.gif - 983 bytes   Indicates that the album is linked to a RiscOS directory or unlinked (arbitrary collection).

readwrite.gif - 1075 bytes  or  readonly.gif - 1078 bytes   Indicates that the data for the images can be modified or read-only (a view).

copy.gif - 460 bytes  or  nocopy.gif - 1078 bytes   Indicates that the images can be copied to other albums or are only viewable.

Images can dragged to or from album views in exactly the same way as files in a RiscOS filer window. Multiple images can be selected by pressing the adjust button on the mouse.

5.1.3 Detail View and Slideshow

A detail view is a large display that is about a quarter to half the screen size. It is displayed by double clicking on an image in the album view:

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For the curious, the picture is of Montrose Abbey with my mother just visible. The image has what appears to be wasted space above and below the image. However, this view uses a square area to display the detail view so that if a slideshow is started the window does not change shape or size if the image changes between portrait and landscape formats. The slideshow "CD Buttons" are at the bottom and a slideshow can be started from any detail view.

A complete album can be displayed as a slideshow by selecting the "Slideshow" menu item from the album menu. The slideshow uses a detail view to display the images.

5.1.4 Displaying Data

The data for an image can be displayed by double clicking over the detail image or selecting the "Display Data" menu item from the album menu:

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The items displayed in the data view are those that are selected from the "Exif Tags" window which can be edited by selecting "Tag Selection" menu item from the iconbar menu. However, all the tags can be viewed by selecting the "Show Tags" menu item from the data menu.

When items are modified the save icon (below) will become unfaded.
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Pressing this icon will save the changes to the database.

Data can be copied from one data view to another and there are two variations. Copying is initiated by dragging the copy icon from one window to another:
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If the icon is dropped over a specific item then only that items data is copied from the source window. If the icon is dropped anywhere else in the data view window than all data items are copied.

5.1.5 Editing Data

Data is edited by typing over the displayed entries. Some entries have a prefix or suffix (units) and these will automatically be amended when a value is changed if it is appropriate to do so. If the cursor is positioned in a tag data entry help can be obtained about that tag by pressing the info icon. The following window will then be displayed.

5.1.6 Exporting Data

The data for an image can be exported to a text file by selecting the "Export Data" option from the data view menu.

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This window allows new data to be typed into the user value area or a value from the pre-defined list (if any exist) can be selected. The pre-defined list is made up a set of values distributed with Thumbcat plus any new values read from EXIF files in the current session.

5.2 Immediate Viewing

Thumbcat can be used to view an image or directory of images without cataloguing them. This is done by dragging the file or folder to the iconbar icon. Thumbcat will then create a temporary catalogue that can be viewed and used exactly as the same as a normal catalogue. Images can be copied to exiting albums if required.

Images can also be exported and if the ctrl-drag option is used then the images can be modified, for example a directory of sprites can be converted to jpegs.

5.3 Importing an Image

Images can be dragged and dropped onto an album view and they will then be added to the album. If the album style is "linked" then images are copied to the linked RiscOS directory. If the album is unlinked then the original location is stored as the reference.

5.4 Exporting an Image

There are 4 types of export:

5.4.1 Modified Copy

When doing a Ctrl-drag the following copy option window will pop-up allowing the copied image to be modified:

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The "Jpeg of exif" option simply adds a jpeg header to an EXIF file and so all the original EXIF data is preserved.

Some of the convert options will be greyed out depending on the format of the original and availability of conversion procedures.

5.4.2 Alt-drag

This option is used when an image is to be edited by another application. If the application then saves any changes the original image, as referenced by Thumbcat, will be modified. Thumbcat will note that the original has changed and will re-create the thumbnails.

Thumbcat will initially check for changes every 0.1s which slows down to a value determined by the user options. Thus old (forgotten?) links have a minimal impact on performance. Links can be dropped by selecting the link from the icon bar menu option "Drop External Link".

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