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1997-10-19
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T h u m p
===========
version 1.00, 17-10-97
by Rick Hudson
This software is FreeWare. It must only be distrubuted in its original form
and there must be no charge for it (except possibly for covering media
costs).
What is Thump?
--------------
Thump is a JPEG thumbnail browser. Thump differs from most other thumbnail
applications in that it does not build and store a special set of thumbnails
- it generates them in real time as you browse the directory structure.
Because of the real-time nature it is suitable for sets of images that change
from time to time because there is no thumbnail library to be outdated.
Of course this has limitations. One is that Thump can only view JPEGs
(because the the OS can render JPEGs reasonaby quickly) - and there are no
plans to ever change that. Another is that displays are not instananeous and
that may be annoying.
It is also possible to attach captions (or descriptions) and keywords to
images although there isn't a search facility yet (it's planned though).
What is it called Thump? I dunno. It just is. Maybe because it's spelt almost
like Thumb.
How is it used?
---------------
Probably the only non-obvious thing is how to get things started. The program
is launched as normal and it installs itself on the icon bar. To view a
directory you need to drag one to Thump's icon bar icon. First Thump collects
information on the JPEGs in the directory (this may take a few seconds if
there are lots of JPEGs) and the display opens with blank rectangles where
the images will go and folder icons for any sub-directories found. Thump will
then proceed to fill in the blanks by drawing the JPEG thumbnails in the
background. Whenever the window needs to be redrawn (parts become visible
again) the blank rectangles will be shown until it can get around to
redrawing the thumbnail again.
Clicking with Select on a folder icon will open a new display as above.
Clicking with Adjust does the same but closes the old display.
Clicking with Select on a thumbnail shows the full-size image and clicking
with Adjust opens the caption edit dbox.
Popping up a menu in a thumbnail display results in this menu:
Display >
File 'xxx' >
Open parent
The Display submenu is similar to the filer's (although no sorting options
are available) providing options resulting in a display also similar to the
filer:
Large images Grid of largish images with leafname underneath
Small images Grid of small images with leafname to the right
Full info Single column of images with name, caption & keywords
The File (or dir.) submenu is this:
View View full image with internal JPEG viewer
External view View full image with external program (Filer_Run)
Edit info Open dbox for editing caption
Open parent opens the directory above the current one. Clicking adjust on the
window's close icon also opens the parent but that also closes the current
display.
Ordinarily Thump loads all the JPEGs into memory for thumbnailing purposes.
If there is insufficient memory the JPEGs will not be loaded and will be
accessed from disc whenever redrawing is required.
When the internal viewer shows a thumbnail it will just show the image from
the thumbnail buffer if it is present. If not present it will allocate a
buffer for the image, load it and display it from that. If the buffer cannot
be claimed it will be rendered directly from disc. If an image is being
rendered from the thumnail buffer and you subsequently close the window
containing the thumbnail the full size image will revert to disc rendering.
Attributing information to images
---------------------------------
The caption editor is straightforward. It is opened by clicking adjust on a
thumbnail image or by selecting 'edit info' from the menu. The current
caption and keywords are shown and can be edited. Clicking on save saves the
information to disc, cancel discards anything you have have done, and view
displays the full size picture. Clicking on the thumbnail also displays the
full image.
You can also attach desriptions to directories (only via the menu). Text may
be dropped on to the fields from another program (usually an editor) or file.
At present the keywords field is technically the same as the caption but the
idea is to describe the picture in the caption but enter significant features
into the keywords with a view to searching for a type of picture. There is no
set format for keywords field but I recommend you use the following guidlines
in case the search engine later depends on it.
- keywords should be separated by commas
- spaces should not be used
eg italy,historic-place
Information is associated with images based on characteristics of the file
only and not the name or location. This means if you move the file or even
rename it, it will retain its description when you see it in its new place.
Searching for pictures
----------------------
The search dbox is opened from the icon-bar menu. Enter words to search for
separated by spaces. Use quotes if you want to search for a phrase that has a
space in it.
Clicking 'Match all' will only select an image if all the words you entered
appear in the text. 'Match any' selects images if one or more words match. In
logic terms 'Match all' is like putting an 'AND' between each word and 'Match
any' is like putting an 'OR' between them.
Choosing 'Description' will look for words in the caption field and choosing
'Keywords' will look for words in the keywords field. Enabling both will
find pictures with words appearing in either field.
Searching is quite rapid and a result display will open when the results are
available. Images are not cached in the thumbnail display so they will be
rendered from disc.
Only pictures that are in the information database can be selected. A picture
does not enter the database until you click save in the caption editor.
At present, if Thump finds a picture in its database that no longer exists
(ie it has been moved or deleted) then you will just see a question icon in
the display. There are plans to add the option of searching the disc for such
missing pictures. In order for Thump to perform searches it stores the last
known location of images for this purpose only. If Thump sees the image in
another place as you browse around you will still see the same description
and keywords because the matching mechanism for this uses characteristics of
the file itself rather than the location. Such changes are updated
automatically when they are detected.
Preferences
-----------
Opening the preferences dbox from the icon bar reveals some things you can
control. The Save, Set and Cancel buttons do the use things. Clicking Save or
Set with Adjust keeps the dbox open whereas clicking with Select closes it.
- Display mode. Determines which format newly opened thumbnail directories
are shown in.
- Thumbnail size. The size of the thumbnail is the currently shown display
mode. Only the dimensions for the mode shown are stored when you click
Save or Set.
- Thumbnail render. Selects one of the available rendering modes. Dithering
improves the display quality if less than 16 milion colours are
available. Error diffused dithering only applies to 256 colour modes and
makes better use of the palette.
- Image render. Selects the rendering mode for the full-sized images in the
same way as thumbnail rendering (above).
- Image buffer. Selects the storage method for full-sized images:
* 'From thumbnail' uses the thumbnail display's buffer if available
* 'Use buffer' forces a separate buffer to be used
* 'From file' uses no static memory and uses the data on disc
If the preferred buffer cannot be used then the next one on the list if
used instead.
- Buffer thumbnails in memory. Selects whether to keep all the images in
memory or not. When disabled, very little memory is used, initial
directory opening is faster and redraw has a small speed penalty
accompanied by some disc activity.
- Respond to dataopen. When enabled Thump will repsond to double-clicks on
JPEGs and render them. Disable it if you use another viewer.
- Use external viewer. When enabled, displaying of full-sized images will
be passed to an external viewer. Thump won't pick up on the render
request if 'Repsond to dataopen' is enabled.
- One image at a time. When enabled, all other full size images will be
closed before opening a new one. Saves closing them manually all the
time.
Version history
---------------
1.01 (17/10/97) - added preferences dbox
- changed info format (already!) to assist in searching
- added searching facility
1.00 (17/10/97) - first version
rick@actrix.gen.nz
http://www.geocities.com/CapeCanaveral/Lab/6722/thump.html