These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 1.08 s (backtrack: 0/20).

[ebuild  N     ] media-libs/giflib-6.1.3:0/7::gentoo  USE="-doc -static-libs" 460 KiB
[ebuild  N     ] media-libs/libid3tag-0.16.4:0/0.16.4::gentoo  48 KiB
[ebuild  N     ] media-libs/libwebp-1.6.0:0/7::gentoo  USE="gif jpeg opengl png tiff -static-libs -swap-16bit-csp" CPU_FLAGS_X86="avx2 sse2 sse4_1" 4196 KiB
[ebuild  N     ] media-libs/imlib2-1.11.0::gentoo  USE="X bzip2 filters gif jpeg jpeg2k mp3 png shm text tiff webp zlib -apidoc -debug -eps -heif -jpegxl -lzma -packing -static-libs -svg" CPU_FLAGS_X86="sse2 (-mmx)" 802 KiB

Total: 4 packages (4 new), Size of downloads: 5504 KiB