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SDL_image PNG's displayed with wrong colors

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My program is a simple tic tac toe game, where x's and o's are represented by two PNG files, both solid color shapes with transparent backgrounds. They are loaded into memory with IMG_Load( "pathname" ) and blitted onto the game board SDL_Surface, which is then rendered to the screen.


The problem is that while the PNG for the x is green and the PNG for the o is red, in the game the x gets drawn as black and the o gets drawn as yellow. Originally the o was drawn as black as well, but changed to yellow after I added yellow text to the background PNG image. The other PNG images that get blitted onto the background (which do not have transparent backgrounds) show up with the correct colors.


This is my code for screen rendering:


// clear screen
SDL_RenderClear( renderer );
// get surface
SDL_Surface* surface = state->getSurface();
// create texture from surface
SDL_Texture* texture = SDL_CreateTextureFromSurface( renderer, surface );
//Render texture to screen
SDL_RenderCopy( renderer, texture, NULL, NULL );
//Update screen
SDL_RenderPresent( renderer );
// remove texture
SDL_DestroyTexture( texture );


I'm not sure if this is a problem with my screen rendering, surface blitting, or something else.

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