Thank you very much!
Result is better, but not best... maybe it is for destination palette.

I contacted author of renderer and he got me full destination palette in color values:
{ 0, 0, 0}, /* Black */
{ 85, 85, 85}, /* Gray */
{ 0, 0, 170}, /* Blue */
{ 85, 85, 255}, /* Light Blue */
{ 0, 170, 0}, /* Green */
{ 85, 255, 85}, /* Light Green */
{ 0, 170, 170}, /* Cyan */
{ 85, 255, 255}, /* Light Cyan */
{170, 0, 0}, /* Red */
{255, 85, 85}, /* Light Red */
{170, 0, 170}, /* Magenta */
{255, 85, 255}, /* Light Magenta */
{170, 85, 0}, /* Brown */
{255, 255, 85}, /* Yellow */
{170, 170, 170}, /* Light Gray */
{255, 255, 255}, /* White */

If I can ask... Try you to adapt, or better give me instructions how to do it and what a software I need?

Thank you for all.
Miro