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Это происходит только для картинок с нужным расширением img или hdr. Для TIF все нормально, но после выравнивания нескольких изображений для tif теряются показатели значений спутниковой информации, привязка и.т.п

jj_kan писал(а):Больше 2 одинаковых толком сшить не удается

Set Transparency
Make the background transparent of the top true color or grayscale layer in the View. This allows black areas to be clipped out of displayed images and can be very helpful when displaying images that are to be mosaicked.

The Pixel Transparency checkbox is located in the Multispectral, Panchromatic, Relief, and Thematic tabs. When the checkbox is checked, the background of the top layer is transparent.

JPEG 2000 Files
For JP2 file formats, the minimum possible data value is made transparent. Unsigned integers will most likely have a null value of zero, but signed integers will have the smallest possible negative number supported by the pixel type.

NoData Value
If a NoData (null) value is set for the image, then all the pixels with that value in the image will be considered as NoData.

If a NoData value is not set for the image, then pixel type and range of pixels must be considered. For example, if the data type is unsigned 8-bit, then the minimum and maximum values of the pixel range is determined. If 0 and 255 are valid pixel values, then the range of the pixels is expanded, that is, the pixel type used internally is set to unsigned 16-bit and the maximum value is used as NoData internally.