I've compressed the kodak test images using the prototype RDO ETC1 compressor I've been working on recently at various settings. You can download a .7z archive containing the RDO compressed .KTX files and unpacked PNG's here. The .KTX files can be loaded using the Mali Texture Compression Tool (v4.3.0).
Here are the unpacked images for 512 endpoints and 1024 selectors (1.65 average bits/texel vs. 2.85 average bits/texel for non-RDO ETC1):
Non-RDO:
best_luma_psnr: Avg: 40.009226, Std Dev: 2.154732, Min: 35.193684, Max: 42.750275, Mean: 41.113007
best_luma_ssim: Avg: 0.983419, Std Dev: 0.002109, Min: 0.980131, Max: 0.989254, Mean: 0.983190
best_bits_per_texel: Avg: 2.851078, Std Dev: 0.341672, Min: 2.184774, Max: 3.482361, Mean: 2.822876
best_orig_size: Avg: 196676.000000, Std Dev: 0.000000, Min: 196676.000000, Max: 196676.000000, Mean: 196676.000000
best_compressed_size: Avg: 140136.166667, Std Dev: 16793.846305, Min: 107386.000000, Max: 171165.000000, Mean: 138750.000000
RDO (#endpoints_#selectors):
512_256:
rdo_luma_psnr: Avg: 31.638530, Std Dev: 2.891301, Min: 25.210732, Max: 35.657692, Mean: 33.023266
rdo_luma_ssim: Avg: 0.903939, Std Dev: 0.022998, Min: 0.839709, Max: 0.941335, Mean: 0.902615
rdo_bits_per_texel: Avg: 1.478541, Std Dev: 0.211604, Min: 1.075765, Max: 1.888489, Mean: 1.453206
512_512:
rdo_luma_psnr: Avg: 32.549770, Std Dev: 2.950959, Min: 25.927277, Max: 36.671211, Mean: 34.135223
rdo_luma_ssim: Avg: 0.916562, Std Dev: 0.020127, Min: 0.860491, Max: 0.950293, Mean: 0.915359
rdo_bits_per_texel: Avg: 1.555512, Std Dev: 0.211616, Min: 1.142314, Max: 1.969767, Mean: 1.533732
512_1024:
rdo_luma_psnr: Avg: 33.600601, Std Dev: 2.981399, Min: 26.842752, Max: 37.809361, Mean: 35.187038
rdo_luma_ssim: Avg: 0.928182, Std Dev: 0.017318, Min: 0.879742, Max: 0.957868, Mean: 0.926356
rdo_bits_per_texel: Avg: 1.648000, Std Dev: 0.208101, Min: 1.249207, Max: 2.055928, Mean: 1.623047
512_2048:
rdo_luma_psnr: Avg: 34.828563, Std Dev: 2.959008, Min: 27.984495, Max: 38.820568, Mean: 36.302998
rdo_luma_ssim: Avg: 0.939762, Std Dev: 0.014454, Min: 0.898490, Max: 0.964750, Mean: 0.938300
rdo_bits_per_texel: Avg: 1.765885, Std Dev: 0.208030, Min: 1.368184, Max: 2.174438, Mean: 1.735372
512_4096:
rdo_luma_psnr: Avg: 36.244860, Std Dev: 2.824295, Min: 29.513725, Max: 39.823002, Mean: 37.670746
rdo_luma_ssim: Avg: 0.951658, Std Dev: 0.011454, Min: 0.918562, Max: 0.971457, Mean: 0.950959
rdo_bits_per_texel: Avg: 1.924732, Std Dev: 0.210003, Min: 1.535360, Max: 2.343709, Mean: 1.893290
1024_4096:
rdo_luma_psnr: Avg: 36.375379, Std Dev: 2.881440, Min: 29.531380, Max: 40.141788, Mean: 37.697235
rdo_luma_ssim: Avg: 0.952464, Std Dev: 0.011512, Min: 0.918884, Max: 0.972384, Mean: 0.951676
rdo_bits_per_texel: Avg: 1.992114, Std Dev: 0.220525, Min: 1.569580, Max: 2.418762, Mean: 1.949666