JoinImg

Command line: JoinImg

Description: join images

TopoLT toolbar:

Menu: TopoLT » Images » Join images

Using this command you can join two or more images from drawing. To join select reference image and images that will be added to that.

Through reference image it is settled:

- color depth at which the added images will be bring to;

- scale in pixels at which the added images will be bring to respecting positions in coordinates and the aspect of these images.

Reference image is accepted only as an image without aspect deformations on dimensions or on angles. If this is deformed or flipped (mirrored) a warning message is posted and the selected image will be modified by eliminating its deformations. Rotated images are accepted as reference images.

Images that will be added to reference image can have deformations, rotations or can be flipped (mirrored).

Note: To obtain a deformed image on dimensions you can use the following steps: create a block with an image entity inside, insert that block in drawing, scale differently on X an Y after which explode the block. In this way you have an image deformed differently on width and height. To obtain an image deformed also on angles introduce in the new created block a rotated image after which scale differently on X and Y and then explode the block.

After selecting the images thumbnails will be loaded in order to make preview.

Joining images

The overlapping order is given by the selecting order and can be changed through modifying position from files list using up or down moving buttons. Images are drawn over background in the order from files list.

You can eliminate images from joining by deselecting them from list. Reference image can not be eliminated.

Options that can be made for each image are described below at "Overlapping general options".

Overlapping general options

Background color can be chosen from color palette or selecting the color of a pixel from thumbnail reference image. Color chosen from palette is reduced to the color format supported by the reference image. For example you can not choose red color for background for a B/W reference image.

Interpolation quality is available only for colored images and through this you can establish the interpolation mode at scaling and rotations for images that are added. Algorithm for interpolation can be: Nearest Neighbor (low quality level), Bilinear (medium quality level) or Bicubic (high quality level). Time of processing depends on the chosen interpolation method, so that for Nearest Neighbor method processing is realized faster than for Bicubic method.

Images transparency can be used for all images as for each image. Transparency is given by a color for which at the overlapping of the respective image it is considered that this color is transparent. Initially this color is taken from image as being the pixel's color from the lower left corner. Transparency color for each image can be changed choosing a color from palette and reducing it to the color depth of the respective image or choosing a color of a pixel from thumbnail image.

Use only subregions (ImageClip) for all images. At joining you can use from image only subregion defined with ImageClip. This option can be chosen for all images or it can be chosen for each image.

Draw boundary clip (ImageClip) for all images. If at joining is chosen to be put only subregion than you can choose if you draw or not the subregion boundary. Drawing is made with lines that have one pixel width and with the color from drawing of the entity image.

If none of the images has defined a clipping boundary then the options for using subregions and for drawing subregions boundary are closed.

Drawing at preview of images' borders is useful to visualize images position. Lines with images' borders are not drew in the image that will result after joining.

Deleting attached images. Selecting this option will erase from drawing image entities that have been attached to the reference image.

Resulted image

Here are posted informations about the image that will result after joining.

Color depth is identical with that of the reference image.

Dimension in pixels depends on the chosen options, the position in coordinates of the images and on the reference image scale. When joining images take care of these factors to avoid creating images with very large dimensions. You can block program execution for computers with insufficient memory or execution will last very long time.

Size of the file that will result is approximated between a minimum and a maximum. There can not be calculated exactly for encoded images just after making the encoding.

Using command Uimg can do return to previous images.

Initial images are saved in files with extension .bk1, .bk2, etc. when they are modified. Files with extension .bk1, .bk2, etc. are used for returning to initial images using command Uimg. Deleting these file will be done manually only after images transformation process ends.

Note: Color tif files are not saved with compression LZW that is why we recommend using Windows programs to compress them.