With no weights specified, almost-equal weights are assumed:

Images will appear to have roughly the same area:

Absolute weights represent a relationship between image areas in the collage:

Scaled weights get multiplied with original image dimensions:

Use Scaled[1] as the weight for all images to preserve original image area ratios:

Compatible Quantity objects can also be used as weights:

Use different fitting schemes to specify how to fit images in the allocated space:

If no size is specified, the collage size is influenced by the original dimensions as well as the method:

Specify the output image width:

Specify the width and height of the output image:

Create a portrait collage:

By default, the background is filled with GrayLevel[0.2]:

Specify a background color:

Use Background->Transparent to create a collage with transparent background:

With Padding->Automatic, images are padded with the background color:

Use a different padding value:

By default, the packing method is automatically selected:

Specify the packing method:

The "ClosestPacking" method tries to find a packing while preserving relative weighted image areas:

The "Grid" method places the images in a regular grid:

The "Rows" method places images in horizontal layers:

Create vertical layers using Method->"Columns":

With Method->"Grid", by default all cells have the same size, equivalent to ItemSize->All:

Use ItemSize->Full to resize each grid cell to its full width and height:

By default, images are not padded:

Specify the same padding size on all sides:

Specify different padding in the horizontal and vertical directions:

Specify different padding for each side:

By default, with Padding->Automatic, images are padded with the same color as Background:

Use a different Background:

Specify a different padding:

By default, a suitable resampling method is chosen:

Specify the resampling method: