Copying Wavelets into an image

Occasionally, it is desired to copy the wavelet coefficients into an image (for example, to illustrate the appearance of a wavelet transform). This can be done by clicking on ``Copy waveletsimage''. A copy of the whatever is being displayed on the screen will be put into the image. It is a good idea to immediately press Ctrl-B or select ``Image..Backup'' to prevent accidentally overwriting the image buffer on subsequent operations. The image now contains a representation of the wavelet display which can be saved on disk.

Notes:

1. If the wavelets are not copied, saving the image will save the original untransformed image data regardless of what is being displayed.
2. Because this is a copy of the screen and does not contain any wavelet coefficients, it cannot be used to recover the original untransformed image.
3. To save the wavelet coefficients, use ``Other functions..Save coefficients''.

Notes

• For grayscale images having depths that are not a multiple of 8 (e.g., 12-bit images), maximize the contrast (``Color..Contrast..Maximize Int.'') before performing a wavelet transformation.
• Best results are obtained if the x and y dimensions are the same size.
• Contrast and brightness adjustments made while the transformed image is being displayed are automatically scaled to wavelet coefficients. Thus, increasing the contrast of some pixels by a factor of 2 will multiply the corresponding wavelet coefficients by 2.
• Negative wavelet coefficients can only be entered using image algebra or by entering the negative value in the spreadsheet.
• The image buffer is automatically enlarged if necessary to display the wavelet coefficients.
• Images cannot be simultaneously transformed by FFT and wavelets.