ImaC - Image Compressor - Help
ImaC - Image Compressor is an app. for compressing images using the JPEG compression technique. This is the Help document for ImaC - Image Compressor.
Menus
File
The File Menu contains three items,
Open,
Save &
Exit.
Open
Opens an image, ready to be compressed.
Save
Saves the compressed image.
Exit
Exit's the ImaC - Image Compressor software.
The Exit menu item is not available for the applet. To end the applet, close the browser tab or surf to another page.
Information
The Information menu has two items,
About &
Help.
About
Pops a dialog giving the application title, vendor and version.
Help
You're looking at it! Opens this page in the default browser.
Controls
The general controls for configuring ImaC - Image Compressor are the image quality slider on the left of the GUI, and the scroll bars for positioning the image views.
Quality slider
Once an uncompressed image is opened (in the top of the splitpane), adjust the image quality slider to see the resulting size and quality of the image in the lower part of the split pane.
Values closer to 100 indicate high image quality/low compression, those closer to 0 are for low image quality/high compression.
Image/size split pane
The main area of ImaC contains a a split pane that contains the image preview and size bar for the two images. The top of the split pane will show the original, unaltered picture. The bottom split pane shows the result of compressing the original image using the JPEG compression quality currently set by the quality slider.
The split pane defaults to providing the two components with the same visual size. Adjust up (to show more of the compressed image) or down (to show more of the original image) as needed.
The application form of ImaC is resizable. Less split pane adjustments are required when the GUI is maximised.
Original Image View
Once an image is opened, the unaltered image will appear in the top part of the split pane.
Image scroll pane
Images are contained within a scroll pane. The scroll bars become visible if the image is wider or deeper than the area designed to display the image.
Use the scroll bars to scroll to the area of the image of most interest, or of which compression is most likely to show undesirable artifacts. The scroll bars of both scroll panes are linked (horizontal↔horizontal, vertical↔vertical) so that as you scroll one image, the other scrollpane should show the approximate same area of the other image.
Size progress bar
The progress bar shown on the bottom of the topmost image will show the size of the loaded image, in relation to a JPEG using compression quality of 1.0 (low compression/high quality).
If the bar is 100% filled, that indicates the original image was uncompressed. If not filled to 100%, it has compression. In the latter case, be careful to ensure that the compressed image/setting size results in an image that is actually smaller than the original!
Compressed Image View
The compressed image will appear in the bottom part of the split pane.
Image scroll pane
See the instructions for the scroll pane of the original image.
Size progress bar
The progress bar shown on the top of the image in the lower area will show the size of the compressed image, in relation to the size of the original image.
Status Message
The status message at the bottom of the ImaC - Image Compressor interface provides feedback and help.
